Merge branch 'release/3.7.1'

2024-12-25 22:47:51 +08:00 · 2019-11-06 20:33:52 +01:00 · 2019-11-06 20:33:52 +01:00 · 43e4db6141
commit 43e4db6141
parent ea60d40f4a aacdc6bbe3
91 changed files with 1452 additions and 840 deletions
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@ -19,6 +19,9 @@ jobs:
      - run:
          name: Create build files
          command: 'mkdir build ; cd build ; cmake ..'
+      - run:
+          name: Versions
+          command: 'g++ --version ; uname -a'
      - run:
          name: Compile
          command: 'cmake --build build'
--- a/.clang-tidy
+++ b/.clang-tidy
@ -4,14 +4,17 @@ Checks: '-*,
         clang-analyzer-*,
         google-*,
         -google-runtime-references,
+         -google-explicit-constructor,
         hicpp-*,
         -hicpp-no-array-decay,
         -hicpp-uppercase-literal-suffix,
+         -hicpp-explicit-conversions,
         misc-*,
         -misc-non-private-member-variables-in-classes,
         llvm-*,
         -llvm-header-guard,
         modernize-*,
+         -modernize-use-trailing-return-type,
         performance-*,
         portability-*,
         readability-*,
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@ -0,0 +1,6 @@
+# JSON for Modern C++ has been originally written by Niels Lohmann.
+# Since 2013 over 140 contributors have helped to improve the library.
+# This CODEOWNERS file is only to make sure that @nlohmann is requsted
+# for a code review in case of a pull request.
+
+* @nlohmann
--- a/.github/SECURITY.md
+++ b/.github/SECURITY.md
@ -0,0 +1,5 @@
+# Security Policy
+
+## Reporting a Vulnerability
+
+Usually, all issues are tracked publicly on [GitHub](https://github.com/nlohmann/json/issues). If you want to make a private report (e.g., for a vulnerability or to attach an example that is not meant to be published), please send an email to <mail@nlohmann.me>. You can use [this key](https://keybase.io/nlohmann/pgp_keys.asc?fingerprint=797167ae41c0a6d9232e48457f3cea63ae251b69) for encryption.
--- a/.github/workflows/ccpp.yml
+++ b/.github/workflows/ccpp.yml
@ -0,0 +1,19 @@
+name: C/C++ CI
+
+on: [push]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+    
+    steps:
+    - uses: actions/checkout@v1
+    - name: prepare
+      run: mkdir build
+    - name: cmake
+      run: cd build ; cmake ..
+    - name: build
+      run: make -C build
+    - name: test
+      run: cd build ; ctest -j 10
--- a/.travis.yml
+++ b/.travis.yml
@ -43,12 +43,15 @@ matrix:
  - os: linux
    compiler: clang
    env:
-      - COMPILER=clang++-5.0
+      - COMPILER=clang++-7
      - CMAKE_OPTIONS=-DJSON_Sanitizer=ON
+      - UBSAN_OPTIONS=print_stacktrace=1,suppressions=$(pwd)/test/src/UBSAN.supp
    addons:
      apt:
-        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-5.0']
-        packages: ['g++-6', 'clang-5.0', 'ninja-build']
+        sources: ['ubuntu-toolchain-r-test', 'llvm-toolchain-trusty-7']
+        packages: ['g++-6', 'clang-7', 'ninja-build']
+    before_script:
+      - export PATH=$PATH:/usr/lib/llvm-7/bin

  # cppcheck
  - os: linux
@ -152,11 +155,14 @@ matrix:
  - os: osx
    osx_image: xcode10.1

+  - os: osx
+    osx_image: xcode10.2
+
  # Linux / GCC

  - os: linux
    compiler: gcc
-    env: compiler=g++-4.8
+    env: COMPILER=g++-4.8
    addons:
      apt:
        sources: ['ubuntu-toolchain-r-test']
@ -164,7 +170,7 @@ matrix:

  - os: linux
    compiler: gcc
-    env: compiler=g++-4.9
+    env: COMPILER=g++-4.9
    addons:
      apt:
        sources: ['ubuntu-toolchain-r-test']
@ -204,13 +210,21 @@ matrix:

  - os: linux
    compiler: gcc
-    env:
-      - COMPILER=g++-8
-      - CXXFLAGS=-std=c++17
+    env: COMPILER=g++-9
    addons:
      apt:
        sources: ['ubuntu-toolchain-r-test']
-        packages: ['g++-8', 'ninja-build']
+        packages: ['g++-9', 'ninja-build']
+
+  - os: linux
+    compiler: gcc
+    env:
+      - COMPILER=g++-9
+      - CXXFLAGS=-std=c++2a
+    addons:
+      apt:
+        sources: ['ubuntu-toolchain-r-test']
+        packages: ['g++-9', 'ninja-build']

  # Linux / Clang

@ -322,7 +336,7 @@ script:
  # compile and execute unit tests
  - mkdir -p build && cd build
  - cmake .. ${CMAKE_OPTIONS} -DJSON_MultipleHeaders=${MULTIPLE_HEADERS} -GNinja && cmake --build . --config Release
-  - ctest -C Release -V -j
+  - ctest -C Release --timeout 2700 -V -j
  - cd ..

  # check if homebrew works (only checks develop branch)   
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@ -4,7 +4,7 @@ cmake_minimum_required(VERSION 3.1)
 ## PROJECT
 ## name and version
 ##
-project(nlohmann_json VERSION 3.7.0 LANGUAGES CXX)
+project(nlohmann_json VERSION 3.7.1 LANGUAGES CXX)

 ##
 ## INCLUDE
--- a/ChangeLog.md
+++ b/ChangeLog.md
@ -1,6 +1,139 @@
 # Change Log
 All notable changes to this project will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org/).

+## [v3.7.1](https://github.com/nlohmann/json/releases/tag/v3.7.1) (2019-11-06)
+[Full Changelog](https://github.com/nlohmann/json/compare/v3.7.0...v3.7.1)
+
+- std::is\_constructible is always true with tuple [\#1825](https://github.com/nlohmann/json/issues/1825)
+- Can't compile from\_json\(std::valarray\<T\>\). [\#1824](https://github.com/nlohmann/json/issues/1824)
+- json class should have a get\_or member function [\#1823](https://github.com/nlohmann/json/issues/1823)
+- NLOHMANN\_JSON\_SERIALIZE\_ENUM macro capture's json objects by value [\#1822](https://github.com/nlohmann/json/issues/1822)
+- Parse fails when number literals start with zero [\#1820](https://github.com/nlohmann/json/issues/1820)
+- Parsing string into json doesn't preserve the order correctly. [\#1817](https://github.com/nlohmann/json/issues/1817)
+- Weird behaviour of `contains` with `json\_pointer` [\#1815](https://github.com/nlohmann/json/issues/1815)
+- strange behaviour with json\_pointer and .contains\(\) [\#1811](https://github.com/nlohmann/json/issues/1811)
+- Can \#1695 be re-opened? [\#1808](https://github.com/nlohmann/json/issues/1808)
+- Merge two json objects [\#1807](https://github.com/nlohmann/json/issues/1807)
+- std::is\_constructible\<json, std::unordered\_map\<std::string, Data\>\> when to\_json not defined [\#1805](https://github.com/nlohmann/json/issues/1805)
+- Private data on parsing [\#1802](https://github.com/nlohmann/json/issues/1802)
+- Capturing Line and Position when querying [\#1800](https://github.com/nlohmann/json/issues/1800)
+- json error on parsing DBL\_MAX from string [\#1796](https://github.com/nlohmann/json/issues/1796)
+- De/Serialisation of vector of tupple object with nested obect need Help please [\#1794](https://github.com/nlohmann/json/issues/1794)
+- Output json is corrupted [\#1793](https://github.com/nlohmann/json/issues/1793)
+- variable name byte sometimes used as a \#define [\#1792](https://github.com/nlohmann/json/issues/1792)
+- Can't read json file [\#1791](https://github.com/nlohmann/json/issues/1791)
+- Problems with special German letters [\#1789](https://github.com/nlohmann/json/issues/1789)
+- Support for trailing commas [\#1787](https://github.com/nlohmann/json/issues/1787)
+- json\_pointer construction bug [\#1786](https://github.com/nlohmann/json/issues/1786)
+- Visual Studio 2017 warning [\#1784](https://github.com/nlohmann/json/issues/1784)
+- ciso646 header become obsolete [\#1782](https://github.com/nlohmann/json/issues/1782)
+- Migrate LGTM.com installation from OAuth to GitHub App [\#1781](https://github.com/nlohmann/json/issues/1781)
+- JSON comparison, contains and operator& [\#1778](https://github.com/nlohmann/json/issues/1778)
+- pass a json object to a class contructor adds an array around the object [\#1776](https://github.com/nlohmann/json/issues/1776)
+- 'Float' number\_float\_function\_t template parameter name conflicts with C '\#define Float float' [\#1775](https://github.com/nlohmann/json/issues/1775)
+- A weird building problem :-\( [\#1774](https://github.com/nlohmann/json/issues/1774)
+- What is this json\_ref? [\#1772](https://github.com/nlohmann/json/issues/1772)
+- Interoperability with other languages [\#1770](https://github.com/nlohmann/json/issues/1770)
+- Json dump [\#1768](https://github.com/nlohmann/json/issues/1768)
+- json\_pointer\<\>::back\(\) should be const [\#1764](https://github.com/nlohmann/json/issues/1764)
+- How to get value from array [\#1762](https://github.com/nlohmann/json/issues/1762)
+- Merge two jsons [\#1757](https://github.com/nlohmann/json/issues/1757)
+- Unable to locate nlohmann\_jsonConfig.cmake [\#1755](https://github.com/nlohmann/json/issues/1755)
+- json.hpp won;t compile VS2019 CLR/CLI app but does in console app [\#1754](https://github.com/nlohmann/json/issues/1754)
+- \[Nested Json Objects\] Segmentation fault [\#1753](https://github.com/nlohmann/json/issues/1753)
+- remove/replace assert with exceptions [\#1752](https://github.com/nlohmann/json/issues/1752)
+- Add array support for update\(\) function [\#1751](https://github.com/nlohmann/json/issues/1751)
+- Is there a reason the `get\_to` method is defined in `include/nlohmann/json.hpp` but not in `single\_include/nlohmann/json.hpp`? [\#1750](https://github.com/nlohmann/json/issues/1750)
+- how to validate json object before calling dump\(\) [\#1748](https://github.com/nlohmann/json/issues/1748)
+- Unable to invoke accessors on json objects in lldb [\#1745](https://github.com/nlohmann/json/issues/1745)
+- Escaping string before parsing [\#1743](https://github.com/nlohmann/json/issues/1743)
+- Construction in a member initializer list using curly braces is set as 'array' [\#1742](https://github.com/nlohmann/json/issues/1742)
+- Read a subkey from json object [\#1740](https://github.com/nlohmann/json/issues/1740)
+- Serialize vector of glm:vec2 [\#1739](https://github.com/nlohmann/json/issues/1739)
+- Support nlohmann::basic\_json::value with JSON\_NOEXCEPTION [\#1738](https://github.com/nlohmann/json/issues/1738)
+- how to know the parse is error [\#1737](https://github.com/nlohmann/json/issues/1737)
+- How to check if a given key exists in a JSON object [\#1736](https://github.com/nlohmann/json/issues/1736)
+- Allow The Colon Key-Value Delimiter To Have A Space Before It \[@ READ ONLY\] [\#1735](https://github.com/nlohmann/json/issues/1735)
+- Allow Tail { "Key": "Value" } Comma \[@ READ ONLY\] [\#1734](https://github.com/nlohmann/json/issues/1734)
+- No-throw json::value\(\) [\#1733](https://github.com/nlohmann/json/issues/1733)
+- JsonObject.dump\(\)  [\#1732](https://github.com/nlohmann/json/issues/1732)
+- basic\_json has no member "parse" [\#1731](https://github.com/nlohmann/json/issues/1731)
+- Exception "type must be string, but is array" [\#1730](https://github.com/nlohmann/json/issues/1730)
+- json::contains usage to find a path [\#1727](https://github.com/nlohmann/json/issues/1727)
+- How to create JSON Object from my Structures of Data and Json File from that Object [\#1726](https://github.com/nlohmann/json/issues/1726)
+- please provide an API to read JSON from file directly. [\#1725](https://github.com/nlohmann/json/issues/1725)
+- How to modify a value stored at a key? [\#1723](https://github.com/nlohmann/json/issues/1723)
+- CMake not correctly finding the configuration package for 3.7.0  [\#1721](https://github.com/nlohmann/json/issues/1721)
+- name typo in the "spack package management" section of README.md [\#1720](https://github.com/nlohmann/json/issues/1720)
+- How to add json to another json? [\#1718](https://github.com/nlohmann/json/issues/1718)
+- How can I save json object in file in order?  [\#1717](https://github.com/nlohmann/json/issues/1717)
+- json::parse\(\) ubsan regression with v3.7.0 [\#1716](https://github.com/nlohmann/json/issues/1716)
+- What I am doing wrong?!? [\#1714](https://github.com/nlohmann/json/issues/1714)
+- Potential memory leak detected by Valgrind [\#1713](https://github.com/nlohmann/json/issues/1713)
+- json::parse is not thread safe? [\#1712](https://github.com/nlohmann/json/issues/1712)
+- static analysis alarm by cppcheck [\#1711](https://github.com/nlohmann/json/issues/1711)
+- The compilation time is slow [\#1710](https://github.com/nlohmann/json/issues/1710)
+- not linking properly with cmake [\#1709](https://github.com/nlohmann/json/issues/1709)
+- Error in dump\(\) with int64\_t minimum value [\#1708](https://github.com/nlohmann/json/issues/1708)
+- Crash on trying to deserialize json string on 3ds homebrew [\#1707](https://github.com/nlohmann/json/issues/1707)
+- Can't compile VS2019. 13 Errors  [\#1706](https://github.com/nlohmann/json/issues/1706)
+- find an object that matches the search criteria [\#1705](https://github.com/nlohmann/json/issues/1705)
+- IntelliSense goes crazy on VS2019 [\#1704](https://github.com/nlohmann/json/issues/1704)
+- Installing on Ubuntu 16.04 [\#1703](https://github.com/nlohmann/json/issues/1703)
+- Where is json::parse now? [\#1702](https://github.com/nlohmann/json/issues/1702)
+- Forward header should't be amalgamated [\#1700](https://github.com/nlohmann/json/issues/1700)
+- Json support for Cmake version 2.8.12 [\#1699](https://github.com/nlohmann/json/issues/1699)
+- Intruisive scientific notation when using .dump\(\); [\#1698](https://github.com/nlohmann/json/issues/1698)
+- Is there support for automatic serialization/deserialization? [\#1696](https://github.com/nlohmann/json/issues/1696)
+- on MSVC dump\(\) will hard crash for larger json [\#1693](https://github.com/nlohmann/json/issues/1693)
+- puzzled implicit conversions [\#1692](https://github.com/nlohmann/json/issues/1692)
+- Information: My project uses this awesome library [\#1691](https://github.com/nlohmann/json/issues/1691)
+- Consider listing files explicitly instead of using GLOB [\#1686](https://github.com/nlohmann/json/issues/1686)
+- Failing tests on MSVC with VS2019 15.9.13 x64 [\#1685](https://github.com/nlohmann/json/issues/1685)
+- Consider putting the user-defined literals in a namespace [\#1682](https://github.com/nlohmann/json/issues/1682)
+- Change from v2 to v3. Encoding with cp1252 [\#1680](https://github.com/nlohmann/json/issues/1680)
+- How to add Fifo\_map into json using Cmake [\#1679](https://github.com/nlohmann/json/issues/1679)
+- include.zip should contain meson.build [\#1672](https://github.com/nlohmann/json/issues/1672)
+- \[Question\] How do I parse JSON into custom types? [\#1669](https://github.com/nlohmann/json/issues/1669)
+- Binary \(0x05\) data type for BSON to JSON conversion [\#1668](https://github.com/nlohmann/json/issues/1668)
+- Possible to call dump from lldb? [\#1666](https://github.com/nlohmann/json/issues/1666)
+- Segmentation fault when linked with libunwind [\#1665](https://github.com/nlohmann/json/issues/1665)
+- Should I include single-header after my to\_json and from\_json custom functions declaration? Why not? [\#1663](https://github.com/nlohmann/json/issues/1663)
+- Errors/Warnings in VS 2019 when Including Header File [\#1659](https://github.com/nlohmann/json/issues/1659)
+- Return null object from object's const operator\[\] as well. [\#1658](https://github.com/nlohmann/json/issues/1658)
+- Can't stream json object in to std::basic\_stringstream\<wchar\_t\> [\#1656](https://github.com/nlohmann/json/issues/1656)
+- C2440 in vs2015 cannot convert from 'initializer-list' to nlohmann::basic\_json [\#1655](https://github.com/nlohmann/json/issues/1655)
+- Issues around get and pointers [\#1653](https://github.com/nlohmann/json/issues/1653)
+- Non-member operator== breaks enum \(de\)serialization [\#1647](https://github.com/nlohmann/json/issues/1647)
+- Valgrind: bytes in 1 blocks are definitely lost [\#1646](https://github.com/nlohmann/json/issues/1646)
+- Convenient way to make 'basic\_json' accept 'QString' as an key type as well? [\#1640](https://github.com/nlohmann/json/issues/1640)
+- mongodb: nan, inf [\#1599](https://github.com/nlohmann/json/issues/1599)
+- Error in adl\_serializer [\#1590](https://github.com/nlohmann/json/issues/1590)
+- Injecting class during serialization [\#1584](https://github.com/nlohmann/json/issues/1584)
+- output\_adapter not user extensible [\#1534](https://github.com/nlohmann/json/issues/1534)
+- Inclusion of nlohmann/json.hpp causes OS/ABI to change on Linux [\#1410](https://github.com/nlohmann/json/issues/1410)
+- Add library versioning using inline namespaces [\#1394](https://github.com/nlohmann/json/issues/1394)
+- CBOR byte string support [\#1129](https://github.com/nlohmann/json/issues/1129)
+- How to deserialize array with derived objects [\#716](https://github.com/nlohmann/json/issues/716)
+
+- Add restriction for tuple specialization of to\_json [\#1826](https://github.com/nlohmann/json/pull/1826) ([cbegue](https://github.com/cbegue))
+- Fix for \#1647 [\#1821](https://github.com/nlohmann/json/pull/1821) ([AnthonyVH](https://github.com/AnthonyVH))
+- Fix issue \#1805 [\#1806](https://github.com/nlohmann/json/pull/1806) ([cbegue](https://github.com/cbegue))
+- Fix some spelling errors - mostly in comments & documentation. [\#1803](https://github.com/nlohmann/json/pull/1803) ([flopp](https://github.com/flopp))
+- Update Hedley to v11. [\#1799](https://github.com/nlohmann/json/pull/1799) ([nemequ](https://github.com/nemequ))
+- iteration\_proxy: Fix integer truncation from std::size\_t to int [\#1797](https://github.com/nlohmann/json/pull/1797) ([t-b](https://github.com/t-b))
+- appveyor.yml: Add MSVC 16 2019 support [\#1780](https://github.com/nlohmann/json/pull/1780) ([t-b](https://github.com/t-b))
+- test/CMakeLists.txt: Use an explicit list instead of GLOB [\#1779](https://github.com/nlohmann/json/pull/1779) ([t-b](https://github.com/t-b))
+- Make json\_pointer::back const \(resolves \#1764\) [\#1769](https://github.com/nlohmann/json/pull/1769) ([chris0x44](https://github.com/chris0x44))
+- did you mean 'serialization'? [\#1767](https://github.com/nlohmann/json/pull/1767) ([0xflotus](https://github.com/0xflotus))
+- Allow items\(\) to be used with custom string [\#1765](https://github.com/nlohmann/json/pull/1765) ([crazyjul](https://github.com/crazyjul))
+- Cppcheck fixes [\#1760](https://github.com/nlohmann/json/pull/1760) ([Xav83](https://github.com/Xav83))
+- Fix and add test's for SFINAE problem [\#1741](https://github.com/nlohmann/json/pull/1741) ([tete17](https://github.com/tete17))
+- Fix clang sanitizer invocation [\#1728](https://github.com/nlohmann/json/pull/1728) ([t-b](https://github.com/t-b))
+- Add gcc 9 and compile with experimental C++20 support [\#1724](https://github.com/nlohmann/json/pull/1724) ([t-b](https://github.com/t-b))
+- Fix int64 min issue [\#1722](https://github.com/nlohmann/json/pull/1722) ([t-b](https://github.com/t-b))
+- release: add singleinclude and meson.build to include.zip [\#1694](https://github.com/nlohmann/json/pull/1694) ([eli-schwartz](https://github.com/eli-schwartz))
+
 ## [v3.7.0](https://github.com/nlohmann/json/releases/tag/v3.7.0) (2019-07-28)
 [Full Changelog](https://github.com/nlohmann/json/compare/v3.6.1...v3.7.0)

@ -233,7 +366,6 @@ All notable changes to this project will be documented in this file. This projec
 - Coverity Scan reports an UNCAUGHT\_EXCEPT issue [\#1400](https://github.com/nlohmann/json/issues/1400)
 - fff [\#1399](https://github.com/nlohmann/json/issues/1399)
 - sorry this is not an issue, just a Question, How to change a key value in a file and save it ? [\#1398](https://github.com/nlohmann/json/issues/1398)
- Add library versioning using inline namespaces [\#1394](https://github.com/nlohmann/json/issues/1394)
 - appveyor x64 builds appear to be using Win32 toolset [\#1374](https://github.com/nlohmann/json/issues/1374)
 - Serializing/Deserializing  a Class containing a vector of itself [\#1373](https://github.com/nlohmann/json/issues/1373)
 - Retrieving array elements. [\#1369](https://github.com/nlohmann/json/issues/1369)
@ -911,7 +1043,6 @@ All notable changes to this project will be documented in this file. This projec
 - Compile-Error C2100 \(MS VS2015\) in line 887 json.hpp [\#719](https://github.com/nlohmann/json/issues/719)
 - from\_json not working for boost::optional example [\#718](https://github.com/nlohmann/json/issues/718)
 - about from\_json and to\_json function [\#717](https://github.com/nlohmann/json/issues/717)
- How to deserialize array with derived objects [\#716](https://github.com/nlohmann/json/issues/716)
 - How to detect parse failure? [\#715](https://github.com/nlohmann/json/issues/715)
 - Parse throw std::ios\_base::failure exception when failbit set to true [\#714](https://github.com/nlohmann/json/issues/714)
 - Is there a way of format just making a pretty print without changing the key's orders ? [\#713](https://github.com/nlohmann/json/issues/713)
--- a/8
+++ b/8
@ -134,7 +134,7 @@ pedantic_clang:

 # calling GCC with most warnings
 pedantic_gcc:
-	$(MAKE) json_unit CXX=/usr/local/bin/g++-9 CXXFLAGS=" \
+	$(MAKE) json_unit CXX=g++-9 CXXFLAGS=" \
 		-std=c++11 \
 		-Waddress \
 		-Waddress-of-packed-member \
@ -435,7 +435,7 @@ fuzzing-stop:
 # call cppcheck <http://cppcheck.sourceforge.net>
 # Note: this target is called by Travis
 cppcheck:
-	cppcheck --enable=warning --inline-suppr --inconclusive --force --std=c++11 $(SRCS) --error-exitcode=1
+	cppcheck --enable=warning --inline-suppr --inconclusive --force --std=c++11 $(AMALGAMATED_FILE) --error-exitcode=1

 # call Clang Static Analyzer <https://clang-analyzer.llvm.org>
 clang_analyze:
@ -457,7 +457,7 @@ cpplint:

 # call Clang-Tidy <https://clang.llvm.org/extra/clang-tidy/>
 clang_tidy:
-	$(COMPILER_DIR)/clang-tidy $(SRCS) -- -Iinclude -std=c++11
+	$(COMPILER_DIR)/clang-tidy $(AMALGAMATED_FILE) -- -Iinclude -std=c++11

 # call PVS-Studio Analyzer <https://www.viva64.com/en/pvs-studio/>
 pvs_studio:
@ -594,7 +594,7 @@ ChangeLog.md:
 release:
 	rm -fr release_files
 	mkdir release_files
-	zip -9 --recurse-paths -X include.zip $(SRCS)
+	zip -9 --recurse-paths -X include.zip $(SRCS) $(AMALGAMATED_FILE) meson.build
 	gpg --armor --detach-sig include.zip
 	mv include.zip include.zip.asc release_files
 	gpg --armor --detach-sig $(AMALGAMATED_FILE)
--- a/README.md
+++ b/README.md
@ -7,6 +7,7 @@
 [![Coverity Scan Build Status](https://scan.coverity.com/projects/5550/badge.svg)](https://scan.coverity.com/projects/nlohmann-json)
 [![Codacy Badge](https://api.codacy.com/project/badge/Grade/f3732b3327e34358a0e9d1fe9f661f08)](https://www.codacy.com/app/nlohmann/json?utm_source=github.com&amp;utm_medium=referral&amp;utm_content=nlohmann/json&amp;utm_campaign=Badge_Grade)
 [![Language grade: C/C++](https://img.shields.io/lgtm/grade/cpp/g/nlohmann/json.svg?logo=lgtm&logoWidth=18)](https://lgtm.com/projects/g/nlohmann/json/context:cpp)
+[![Fuzzing Status](https://oss-fuzz-build-logs.storage.googleapis.com/badges/json.svg)](https://bugs.chromium.org/p/oss-fuzz/issues/list?sort=-opened&can=1&q=proj:json)
 [![Try online](https://img.shields.io/badge/try-online-blue.svg)](https://wandbox.org/permlink/TarF5pPn9NtHQjhf)
 [![Documentation](https://img.shields.io/badge/docs-doxygen-blue.svg)](http://nlohmann.github.io/json)
 [![GitHub license](https://img.shields.io/badge/license-MIT-blue.svg)](https://raw.githubusercontent.com/nlohmann/json/master/LICENSE.MIT)
@ -152,11 +153,13 @@ endif()

 :beer: If you are using OS X and [Homebrew](http://brew.sh), just type `brew tap nlohmann/json` and `brew install nlohmann-json` and you're set. If you want the bleeding edge rather than the latest release, use `brew install nlohmann-json --HEAD`.

-If you are using the [Meson Build System](http://mesonbuild.com), then you can get a wrap file by downloading it from [Meson WrapDB](https://wrapdb.mesonbuild.com/nlohmann_json), or simply use `meson wrap install nlohmann_json`.
+If you are using the [Meson Build System](http://mesonbuild.com), add this source tree as a [meson subproject](https://mesonbuild.com/Subprojects.html#using-a-subproject). You may also use the `include.zip` published in this project's [Releases](https://github.com/nlohmann/json/releases) to reduce the size of the vendored source tree. Alternatively, you can get a wrap file by downloading it from [Meson WrapDB](https://wrapdb.mesonbuild.com/nlohmann_json), or simply use `meson wrap install nlohmann_json`. Please see the meson project for any issues regarding the packaging.
+
+The provided meson.build can also be used as an alternative to cmake for installing `nlohmann_json` system-wide in which case a pkg-config file is installed. To use it, simply have your build system require the `nlohmann_json` pkg-config dependency. In Meson, it is preferred to use the [`dependency()`](https://mesonbuild.com/Reference-manual.html#dependency) object with a subproject fallback, rather than using the subproject directly.

 If you are using [Conan](https://www.conan.io/) to manage your dependencies, merely add `jsonformoderncpp/x.y.z@vthiery/stable` to your `conanfile.py`'s requires, where `x.y.z` is the release version you want to use. Please file issues [here](https://github.com/vthiery/conan-jsonformoderncpp/issues) if you experience problems with the packages.

-If you are using [Spack](https://www.spack.io/) to manage your dependencies, you can use the `nlohmann_json` package. Please see the [spack project](https://github.com/spack/spack) for any issues regarding the packaging.
+If you are using [Spack](https://www.spack.io/) to manage your dependencies, you can use the [`nlohmann-json` package](https://spack.readthedocs.io/en/latest/package_list.html#nlohmann-json). Please see the [spack project](https://github.com/spack/spack) for any issues regarding the packaging.

 If you are using [hunter](https://github.com/ruslo/hunter/) on your project for external dependencies, then you can use the [nlohmann_json package](https://docs.hunter.sh/en/latest/packages/pkg/nlohmann_json.html). Please see the hunter project for any issues regarding the packaging.

@ -927,7 +930,7 @@ NLOHMANN_JSON_SERIALIZE_ENUM( TaskState, {
 })
 ```

-The `NLOHMANN_JSON_SERIALIZE_ENUM()` macro declares a set of `to_json()` / `from_json()` functions for type `TaskState` while avoiding repetition and boilerplate serilization code.
+The `NLOHMANN_JSON_SERIALIZE_ENUM()` macro declares a set of `to_json()` / `from_json()` functions for type `TaskState` while avoiding repetition and boilerplate serialization code.

 **Usage:**

@ -999,11 +1002,12 @@ json j_from_ubjson = json::from_ubjson(v_ubjson);

 Though it's 2019 already, the support for C++11 is still a bit sparse. Currently, the following compilers are known to work:

- GCC 4.8 - 9.0 (and possibly later)
- Clang 3.4 - 8.0 (and possibly later)
+- GCC 4.8 - 9.2 (and possibly later)
+- Clang 3.4 - 9.0 (and possibly later)
 - Intel C++ Compiler 17.0.2 (and possibly later)
 - Microsoft Visual C++ 2015 / Build Tools 14.0.25123.0 (and possibly later)
 - Microsoft Visual C++ 2017 / Build Tools 15.5.180.51428 (and possibly later)
+- Microsoft Visual C++ 2019 / Build Tools 16.3.1+1def00d3d (and possibly later)

 I would be happy to learn about other compilers/versions.

@ -1024,7 +1028,7 @@ Please note:

 - Unsupported versions of GCC and Clang are rejected by `#error` directives. This can be switched off by defining `JSON_SKIP_UNSUPPORTED_COMPILER_CHECK`. Note that you can expect no support in this case.

-The following compilers are currently used in continuous integration at [Travis](https://travis-ci.org/nlohmann/json), [AppVeyor](https://ci.appveyor.com/project/nlohmann/json), and [Doozer](https://doozer.io):
+The following compilers are currently used in continuous integration at [Travis](https://travis-ci.org/nlohmann/json), [AppVeyor](https://ci.appveyor.com/project/nlohmann/json), [CircleCI](https://circleci.com/gh/nlohmann/json), and [Doozer](https://doozer.io):

 | Compiler              | Operating System             | Version String |
 |-----------------------|------------------------------|----------------|
@ -1034,11 +1038,13 @@ The following compilers are currently used in continuous integration at [Travis]
 | GCC 4.9.4             | Ubuntu 14.04.1 LTS           | g++-4.9 (Ubuntu 4.9.4-2ubuntu1~14.04.1) 4.9.4 |
 | GCC 5.3.1 (armv7l)    | Ubuntu 16.04 LTS             | g++ (Ubuntu/Linaro 5.3.1-14ubuntu2) 5.3.1 20160413 |
 | GCC 5.5.0             | Ubuntu 14.04.1 LTS           | g++-5 (Ubuntu 5.5.0-12ubuntu1~14.04) 5.5.0 20171010 |
+| GCC 6.3.0             | Debian 9 (stretch)           | g++ (Debian 6.3.0-18+deb9u1) 6.3.0 20170516 |
 | GCC 6.3.1             | Fedora release 24 (Twenty Four) | g++ (GCC) 6.3.1 20161221 (Red Hat 6.3.1-1) |
 | GCC 6.4.0             | Ubuntu 14.04.1 LTS           | g++-6 (Ubuntu 6.4.0-17ubuntu1~14.04) 6.4.0 20180424 |
 | GCC 7.3.0             | Ubuntu 14.04.1 LTS           | g++-7 (Ubuntu 7.3.0-21ubuntu1~14.04) 7.3.0 |
 | GCC 7.3.0             | Windows Server 2012 R2 (x64) | g++ (x86_64-posix-seh-rev0, Built by MinGW-W64 project) 7.3.0 |
 | GCC 8.1.0             | Ubuntu 14.04.1 LTS           | g++-8 (Ubuntu 8.1.0-5ubuntu1~14.04) 8.1.0 |
+| GCC 9.2.1             | Ubuntu 14.05.1 LTS           | g++-9 (Ubuntu 9.2.1-16ubuntu1~14.04.1) 9.2.1 20191030 |
 | Clang 3.5.0           | Ubuntu 14.04.1 LTS           | clang version 3.5.0-4ubuntu2~trusty2 (tags/RELEASE_350/final) (based on LLVM 3.5.0) |
 | Clang 3.6.2           | Ubuntu 14.04.1 LTS           | clang version 3.6.2-svn240577-1~exp1 (branches/release_36) (based on LLVM 3.6.2) |
 | Clang 3.7.1           | Ubuntu 14.04.1 LTS           | clang version 3.7.1-svn253571-1~exp1 (branches/release_37) (based on LLVM 3.7.1) |
@ -1055,8 +1061,10 @@ The following compilers are currently used in continuous integration at [Travis]
 | Clang Xcode 9.3       | OSX 10.13.3                  | Apple LLVM version 9.1.0 (clang-902.0.39.2) |
 | Clang Xcode 10.0      | OSX 10.13.3                  | Apple LLVM version 10.0.0 (clang-1000.11.45.2) |
 | Clang Xcode 10.1      | OSX 10.13.3                  | Apple LLVM version 10.0.0 (clang-1000.11.45.5) |
+| Clang Xcode 10.2      | OSX 10.14.4                  | Apple LLVM version 10.0.1 (clang-1001.0.46.4) |
 | Visual Studio 14 2015 | Windows Server 2012 R2 (x64) | Microsoft (R) Build Engine version 14.0.25420.1, MSVC 19.0.24215.1 |
-| Visual Studio 2017    | Windows Server 2016 | Microsoft (R) Build Engine version 15.7.180.61344, MSVC 19.14.26433.0 |
+| Visual Studio 15 2017 | Windows Server 2012 R2 (x64) | Microsoft (R) Build Engine version 15.9.21+g9802d43bc3, MSVC 19.16.27032.1 |
+| Visual Studio 16 2019 | Windows Server 2012 R2 (x64) | Microsoft (R) Build Engine version 16.3.1+1def00d3d, MSVC 19.23.28106.4 |

 ## License

@ -1251,7 +1259,7 @@ I deeply appreciate the help of the following people.
 - [Ivor Wanders](https://github.com/iwanders) helped reducing the CMake requirement to version 3.1.
 - [njlr](https://github.com/njlr) updated the Buckaroo instructions.
 - [Lion](https://github.com/lieff) fixed a compilation issue with GCC 7 on CentOS.
- [Isaac Nickaein](https://github.com/nickaein) improved the integer serilization performance and  implemented the `contains()` function.
+- [Isaac Nickaein](https://github.com/nickaein) improved the integer serialization performance and  implemented the `contains()` function.
 - [past-due](https://github.com/past-due) suppressed an unfixable warning.
 - [Elvis Oric](https://github.com/elvisoric) improved Meson support.
 - [Matěj Plch](https://github.com/Afforix) fixed an example in the README.
@ -1269,6 +1277,16 @@ I deeply appreciate the help of the following people.
 - [Gabe Ron](https://github.com/Macr0Nerd) implemented the `to_string` method.
 - [Watal M. Iwasaki](https://github.com/heavywatal) fixed a Clang warning.
 - [Viktor Kirilov](https://github.com/onqtam) switched the unit tests from [Catch](https://github.com/philsquared/Catch) to [doctest](https://github.com/onqtam/doctest)
+- [Juncheng E](https://github.com/ejcjason) fixed a typo.
+- [tete17](https://github.com/tete17) fixed a bug in the `contains` function.
+- [Xav83](https://github.com/Xav83) fixed some cppcheck warnings.
+- [0xflotus](https://github.com/0xflotus) fixed some typos.
+- [Christian Deneke](https://github.com/chris0x44) added a const version of `json_pointer::back`.
+- [Julien Hamaide](https://github.com/crazyjul) made the `items()` function work with custom string types.
+- [Evan Nemerson](https://github.com/nemequ) updated fixed a bug in Hedley and updated this library accordingly.
+- [Florian Pigorsch](https://github.com/flopp) fixed a lot of typos.
+- [Camille Bégué](https://github.com/cbegue) fixed an issue in the conversion from  `std::pair` and `std::tuple` to `json`.
+- [Anthony VH](https://github.com/AnthonyVH) fixed a compile error in an enum deserialization.

 Thanks a lot for helping out! Please [let me know](mailto:mail@nlohmann.me) if I forgot someone.

@ -1353,7 +1371,7 @@ By default, the library does not preserve the **insertion order of object elemen
 - The code contains numerous debug **assertions** which can be switched off by defining the preprocessor macro `NDEBUG`, see the [documentation of `assert`](https://en.cppreference.com/w/cpp/error/assert). In particular, note [`operator[]`](https://nlohmann.github.io/json/classnlohmann_1_1basic__json_a233b02b0839ef798942dd46157cc0fe6.html#a233b02b0839ef798942dd46157cc0fe6) implements **unchecked access** for const objects: If the given key is not present, the behavior is undefined (think of a dereferenced null pointer) and yields an [assertion failure](https://github.com/nlohmann/json/issues/289) if assertions are switched on. If you are not sure whether an element in an object exists, use checked access with the [`at()` function](https://nlohmann.github.io/json/classnlohmann_1_1basic__json_a73ae333487310e3302135189ce8ff5d8.html#a73ae333487310e3302135189ce8ff5d8).
 - As the exact type of a number is not defined in the [JSON specification](https://tools.ietf.org/html/rfc8259.html), this library tries to choose the best fitting C++ number type automatically. As a result, the type `double` may be used to store numbers which may yield [**floating-point exceptions**](https://github.com/nlohmann/json/issues/181) in certain rare situations if floating-point exceptions have been unmasked in the calling code. These exceptions are not caused by the library and need to be fixed in the calling code, such as by re-masking the exceptions prior to calling library functions.
 - The code can be compiled without C++ **runtime type identification** features; that is, you can use the `-fno-rtti` compiler flag.
- **Exceptions** are used widely within the library. They can, however, be switched off with either using the compiler flag `-fno-exceptions` or by defining the symbol `JSON_NOEXCEPTION`. In this case, exceptions are replaced by an `abort()` call.
+- **Exceptions** are used widely within the library. They can, however, be switched off with either using the compiler flag `-fno-exceptions` or by defining the symbol `JSON_NOEXCEPTION`. In this case, exceptions are replaced by `abort()` calls. You can further control this behavior by defining `JSON_THROW_USER´` (overriding `throw`), `JSON_TRY_USER` (overriding `try`), and `JSON_CATCH_USER` (overriding `catch`). Note that `JSON_THROW_USER` should leave the current scope (e.g., by throwing or aborting), as continuing after it may yield undefined behavior.

 ## Execute unit tests

--- a/appveyor.yml
+++ b/appveyor.yml
@ -16,6 +16,20 @@ environment:
      LINKER_FLAGS: ""
      GENERATOR: Visual Studio 15 2017

+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
+      configuration: Debug
+      platform: x86
+      CXX_FLAGS: ""
+      LINKER_FLAGS: ""
+      GENERATOR: Visual Studio 16 2019
+
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
+      configuration: Debug
+      platform: x64
+      CXX_FLAGS: ""
+      LINKER_FLAGS: ""
+      GENERATOR: Visual Studio 16 2019
+
    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
      configuration: Debug
      COMPILER: mingw
@ -47,13 +61,6 @@ environment:
      LINKER_FLAGS: ""
      GENERATOR: Visual Studio 14 2015

-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      configuration: Release
-      platform: x86
-      CXX_FLAGS: ""
-      LINKER_FLAGS: ""
-      GENERATOR: Visual Studio 15 2017
-
    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
      configuration: Release
      platform: x86
@ -61,43 +68,51 @@ environment:
      LINKER_FLAGS: ""
      GENERATOR: Visual Studio 15 2017

+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
+      configuration: Release
+      platform: x86
+      CXX_FLAGS: ""
+      LINKER_FLAGS: ""
+      GENERATOR: Visual Studio 16 2019
+
    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
      configuration: Release
      platform: x64
      CXX_FLAGS: ""
      LINKER_FLAGS: ""
-      GENERATOR: Visual Studio 14 2015 Win64
-
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
-      configuration: Release
-      platform: x64
-      CXX_FLAGS: ""
-      LINKER_FLAGS: ""
-      GENERATOR: Visual Studio 15 2017 Win64
+      GENERATOR: Visual Studio 14 2015

    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
      configuration: Release
      platform: x64
      CXX_FLAGS: "/permissive- /std:c++latest /utf-8 /F4000000"
      LINKER_FLAGS: "/STACK:4000000"
-      GENERATOR: Visual Studio 15 2017 Win64
+      GENERATOR: Visual Studio 15 2017
+
+    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
+      configuration: Release
+      platform: x64
+      CXX_FLAGS: ""
+      LINKER_FLAGS: ""
+      GENERATOR: Visual Studio 16 2019

 init:
  - cmake --version
  - msbuild /version

 install:
-  - if "%COMPILER%"=="mingw" appveyor DownloadFile https://github.com/ninja-build/ninja/releases/download/v1.6.0/ninja-win.zip -FileName ninja.zip
-  - if "%COMPILER%"=="mingw" 7z x ninja.zip -oC:\projects\deps\ninja > nul
-  - if "%COMPILER%"=="mingw" set PATH=C:\projects\deps\ninja;%PATH%
-  - if "%COMPILER%"=="mingw" set PATH=C:\mingw-w64\x86_64-7.3.0-posix-seh-rt_v5-rev0\mingw64\bin;%PATH%
-  - if "%COMPILER%"=="mingw" g++ --version
+  - if "%COMPILER%"=="mingw"  appveyor DownloadFile https://github.com/ninja-build/ninja/releases/download/v1.6.0/ninja-win.zip -FileName ninja.zip
+  - if "%COMPILER%"=="mingw"  7z x ninja.zip -oC:\projects\deps\ninja > nul
+  - if "%COMPILER%"=="mingw"  set PATH=C:\projects\deps\ninja;%PATH%
+  - if "%COMPILER%"=="mingw"  set PATH=C:\mingw-w64\x86_64-7.3.0-posix-seh-rt_v5-rev0\mingw64\bin;%PATH%
+  - if "%COMPILER%"=="mingw"  g++ --version
+  - if "%platform%"=="x86"    set GENERATOR_PLATFORM=Win32

 before_build:
  # for with_win_header build, inject the inclusion of Windows.h to the single-header library
  - ps: if ($env:name -Eq "with_win_header") { $header_path = "single_include\nlohmann\json.hpp" }
  - ps: if ($env:name -Eq "with_win_header") { "#include <Windows.h>`n" + (Get-Content $header_path | Out-String) | Set-Content $header_path }
-  - cmake . -G "%GENERATOR%" -DCMAKE_BUILD_TYPE="%configuration%" -DCMAKE_CXX_FLAGS="%CXX_FLAGS%" -DCMAKE_EXE_LINKER_FLAGS="%LINKER_FLAGS%" -DCMAKE_IGNORE_PATH="C:/Program Files/Git/usr/bin"
+  - if "%GENERATOR%"=="Ninja" (cmake . -G "%GENERATOR%" -DCMAKE_BUILD_TYPE="%configuration%" -DCMAKE_CXX_FLAGS="%CXX_FLAGS%" -DCMAKE_EXE_LINKER_FLAGS="%LINKER_FLAGS%" -DCMAKE_IGNORE_PATH="C:/Program Files/Git/usr/bin") else (cmake . -G "%GENERATOR%" -A "%GENERATOR_PLATFORM%" -DCMAKE_CXX_FLAGS="%CXX_FLAGS%" -DCMAKE_EXE_LINKER_FLAGS="%LINKER_FLAGS%" -DCMAKE_IGNORE_PATH="C:/Program Files/Git/usr/bin")

 build_script:
  - cmake --build . --config "%configuration%"
--- a/doc/Doxyfile
+++ b/doc/Doxyfile
@ -5,7 +5,7 @@
 #---------------------------------------------------------------------------
 DOXYFILE_ENCODING      = UTF-8
 PROJECT_NAME           = "JSON for Modern C++"
-PROJECT_NUMBER         = 3.7.0
+PROJECT_NUMBER         = 3.7.1
 PROJECT_BRIEF          =
 PROJECT_LOGO           =
 OUTPUT_DIRECTORY       = .
--- a/doc/avatars.png
+++ b/doc/avatars.png
--- a/doc/examples/README.link
+++ b/doc/examples/README.link
@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/tD2mLxlcQZLrIvFW"><b>online</b></a>
+<a target="_blank" href="https://wandbox.org/permlink/aMsX89i37S5EFFt2"><b>online</b></a>
--- a/doc/examples/json_pointer__operator_add.cpp
+++ b/doc/examples/json_pointer__operator_add.cpp
@ -9,7 +9,7 @@ int main()
    json::json_pointer ptr("/foo");
    std::cout << ptr << '\n';

-    // apppend a JSON Pointer
+    // append a JSON Pointer
    ptr /= json::json_pointer("/bar/baz");
    std::cout << ptr << '\n';

--- a/doc/examples/json_pointer__operator_add.link
+++ b/doc/examples/json_pointer__operator_add.link
@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/9GFummh9iBAkOFiL"><b>online</b></a>
+<a target="_blank" href="https://wandbox.org/permlink/B8QFt317rARJWiGI"><b>online</b></a>
--- a/doc/examples/json_pointer__operator_add_binary.cpp
+++ b/doc/examples/json_pointer__operator_add_binary.cpp
@ -8,7 +8,7 @@ int main()
    // create a JSON pointer
    json::json_pointer ptr("/foo");

-    // apppend a JSON Pointer
+    // append a JSON Pointer
    std::cout << ptr / json::json_pointer("/bar/baz") << '\n';

    // append a string
--- a/doc/examples/json_pointer__operator_add_binary.link
+++ b/doc/examples/json_pointer__operator_add_binary.link
@ -1 +1 @@
-<a target="_blank" href="https://wandbox.org/permlink/mxBfUH9gOY9AiOOk"><b>online</b></a>
+<a target="_blank" href="https://wandbox.org/permlink/SEuKMiM0vuzQDU8U"><b>online</b></a>
--- a/doc/examples/meta.output
+++ b/doc/examples/meta.output
@ -2,7 +2,7 @@
    "compiler": {
        "c++": "201103",
        "family": "clang",
-        "version": "10.0.1 (clang-1001.0.46.4)"
+        "version": "11.0.0 (clang-1100.0.33.8)"
    },
    "copyright": "(C) 2013-2017 Niels Lohmann",
    "name": "JSON for Modern C++",
@ -11,7 +11,7 @@
    "version": {
        "major": 3,
        "minor": 7,
-        "patch": 0,
-        "string": "3.7.0"
+        "patch": 1,
+        "string": "3.7.1"
    }
 }
--- a/doc/index.md
+++ b/doc/index.md
@ -329,4 +329,4 @@ Note that this table only lists those exceptions thrown due to the type. For ins
@author [Niels Lohmann](http://nlohmann.me)
@see https://github.com/nlohmann/json to download the source code

-@version 3.7.0
+@version 3.7.1
--- a/doc/json.gif
+++ b/doc/json.gif
--- a/include/nlohmann/detail/conversions/from_json.hpp
+++ b/include/nlohmann/detail/conversions/from_json.hpp
@ -154,7 +154,7 @@ void from_json(const BasicJsonType& j, std::valarray<T>& l)
        JSON_THROW(type_error::create(302, "type must be array, but is " + std::string(j.type_name())));
    }
    l.resize(j.size());
-    std::copy(j.m_value.array->begin(), j.m_value.array->end(), std::begin(l));
+    std::copy(j.begin(), j.end(), std::begin(l));
 }

 template <typename BasicJsonType, typename T, std::size_t N>
--- a/include/nlohmann/detail/conversions/to_chars.hpp
+++ b/include/nlohmann/detail/conversions/to_chars.hpp
@ -330,7 +330,7 @@ inline cached_power get_cached_power_for_binary_exponent(int e)
    //      ==> 2^(q - 1 + alpha) <= c * 2^(e + q)
    //      ==> 2^(alpha - e - 1) <= c
    //
-    // If c were an exakt power of ten, i.e. c = 10^k, one may determine k as
+    // If c were an exact power of ten, i.e. c = 10^k, one may determine k as
    //
    //      k = ceil( log_10( 2^(alpha - e - 1) ) )
    //        = ceil( (alpha - e - 1) * log_10(2) )
--- a/include/nlohmann/detail/conversions/to_json.hpp
+++ b/include/nlohmann/detail/conversions/to_json.hpp
@ -154,7 +154,10 @@ struct external_constructor<value_t::array>
        j.m_type = value_t::array;
        j.m_value = value_t::array;
        j.m_value.array->resize(arr.size());
-        std::copy(std::begin(arr), std::end(arr), j.m_value.array->begin());
+        if (arr.size() > 0)
+        {
+            std::copy(std::begin(arr), std::end(arr), j.m_value.array->begin());
+        }
        j.assert_invariant();
    }
 };
@ -299,8 +302,8 @@ void to_json(BasicJsonType& j, const T(&arr)[N])
    external_constructor<value_t::array>::construct(j, arr);
 }

-template<typename BasicJsonType, typename... Args>
-void to_json(BasicJsonType& j, const std::pair<Args...>& p)
+template < typename BasicJsonType, typename T1, typename T2, enable_if_t < std::is_constructible<BasicJsonType, T1>::value&& std::is_constructible<BasicJsonType, T2>::value, int > = 0 >
+void to_json(BasicJsonType& j, const std::pair<T1, T2>& p)
 {
    j = { p.first, p.second };
 }
@ -319,10 +322,10 @@ void to_json_tuple_impl(BasicJsonType& j, const Tuple& t, index_sequence<Idx...>
    j = { std::get<Idx>(t)... };
 }

-template<typename BasicJsonType, typename... Args>
-void to_json(BasicJsonType& j, const std::tuple<Args...>& t)
+template<typename BasicJsonType, typename T, enable_if_t<is_constructible_tuple<BasicJsonType, T>::value, int > = 0>
+void to_json(BasicJsonType& j, const T& t)
 {
-    to_json_tuple_impl(j, t, index_sequence_for<Args...> {});
+    to_json_tuple_impl(j, t, make_index_sequence<std::tuple_size<T>::value> {});
 }

 struct to_json_fn
--- a/include/nlohmann/detail/input/binary_reader.hpp
+++ b/include/nlohmann/detail/input/binary_reader.hpp
@ -647,7 +647,7 @@ class binary_reader
                    const int exp = (half >> 10u) & 0x1Fu;
                    const unsigned int mant = half & 0x3FFu;
                    assert(0 <= exp and exp <= 32);
-                    assert(0 <= mant and mant <= 1024);
+                    assert(mant <= 1024);
                    switch (exp)
                    {
                        case 0:
@ -1929,7 +1929,7 @@ class binary_reader
    /*!
    @param[in] format   the current format
    @param[in] detail   a detailed error message
-    @param[in] context  further contect information
+    @param[in] context  further context information
    @return a message string to use in the parse_error exceptions
    */
    std::string exception_message(const input_format_t format,
--- a/include/nlohmann/detail/input/input_adapters.hpp
+++ b/include/nlohmann/detail/input/input_adapters.hpp
@ -131,9 +131,8 @@ class input_stream_adapter : public input_adapter_protocol
 class input_buffer_adapter : public input_adapter_protocol
 {
  public:
-    JSON_HEDLEY_NON_NULL(2)
    input_buffer_adapter(const char* b, const std::size_t l) noexcept
-        : cursor(b), limit(b + l)
+        : cursor(b), limit(b == nullptr ? nullptr : (b + l))
    {}

    // delete because of pointer members
@ -147,6 +146,7 @@ class input_buffer_adapter : public input_adapter_protocol
    {
        if (JSON_HEDLEY_LIKELY(cursor < limit))
        {
+            assert(cursor != nullptr and limit != nullptr);
            return std::char_traits<char>::to_int_type(*(cursor++));
        }

--- a/include/nlohmann/detail/iterators/iter_impl.hpp
+++ b/include/nlohmann/detail/iterators/iter_impl.hpp
@ -121,8 +121,8 @@ class iter_impl
    /*!
    @brief const copy constructor
    @param[in] other const iterator to copy from
-    @note This copy constuctor had to be defined explicitely to circumvent a bug
-          occuring on msvc v19.0 compiler (VS 2015) debug build. For more
+    @note This copy constructor had to be defined explicitly to circumvent a bug
+          occurring on msvc v19.0 compiler (VS 2015) debug build. For more
          information refer to: https://github.com/nlohmann/json/issues/1608
    */
    iter_impl(const iter_impl<const BasicJsonType>& other) noexcept
--- a/include/nlohmann/detail/iterators/iteration_proxy.hpp
+++ b/include/nlohmann/detail/iterators/iteration_proxy.hpp
@ -12,6 +12,11 @@ namespace nlohmann
 {
 namespace detail
 {
+template<typename string_type>
+void int_to_string( string_type& target, std::size_t value )
+{
+    target = std::to_string(value);
+}
 template <typename IteratorType> class iteration_proxy_value
 {
  public:
@ -20,6 +25,7 @@ template <typename IteratorType> class iteration_proxy_value
    using pointer = value_type * ;
    using reference = value_type & ;
    using iterator_category = std::input_iterator_tag;
+    using string_type = typename std::remove_cv< typename std::remove_reference<decltype( std::declval<IteratorType>().key() ) >::type >::type;

  private:
    /// the iterator
@ -29,9 +35,9 @@ template <typename IteratorType> class iteration_proxy_value
    /// last stringified array index
    mutable std::size_t array_index_last = 0;
    /// a string representation of the array index
-    mutable std::string array_index_str = "0";
+    mutable string_type array_index_str = "0";
    /// an empty string (to return a reference for primitive values)
-    const std::string empty_str = "";
+    const string_type empty_str = "";

  public:
    explicit iteration_proxy_value(IteratorType it) noexcept : anchor(it) {}
@ -64,7 +70,7 @@ template <typename IteratorType> class iteration_proxy_value
    }

    /// return key of the iterator
-    const std::string& key() const
+    const string_type& key() const
    {
        assert(anchor.m_object != nullptr);

@ -75,7 +81,7 @@ template <typename IteratorType> class iteration_proxy_value
            {
                if (array_index != array_index_last)
                {
-                    array_index_str = std::to_string(array_index);
+                    int_to_string( array_index_str, array_index );
                    array_index_last = array_index;
                }
                return array_index_str;
--- a/include/nlohmann/detail/json_pointer.hpp
+++ b/include/nlohmann/detail/json_pointer.hpp
@ -126,7 +126,7 @@ class json_pointer
    /*!
    @brief append an array index at the end of this JSON pointer

-    @param[in] array_index  array index ot append
+    @param[in] array_index  array index to append
    @return JSON pointer with @a array_index appended

    @liveexample{The example shows the usage of `operator/=`.,json_pointer__operator_add}
@ -267,7 +267,7 @@ class json_pointer

    @since version 3.6.0
    */
-    const std::string& back()
+    const std::string& back() const
    {
        if (JSON_HEDLEY_UNLIKELY(empty()))
        {
--- a/include/nlohmann/detail/macro_scope.hpp
+++ b/include/nlohmann/detail/macro_scope.hpp
@ -78,30 +78,30 @@
@def NLOHMANN_JSON_SERIALIZE_ENUM
@since version 3.4.0
 */
-#define NLOHMANN_JSON_SERIALIZE_ENUM(ENUM_TYPE, ...)                                           \
-    template<typename BasicJsonType>                                                           \
-    inline void to_json(BasicJsonType& j, const ENUM_TYPE& e)                                  \
-    {                                                                                          \
-        static_assert(std::is_enum<ENUM_TYPE>::value, #ENUM_TYPE " must be an enum!");         \
-        static const std::pair<ENUM_TYPE, BasicJsonType> m[] = __VA_ARGS__;                    \
-        auto it = std::find_if(std::begin(m), std::end(m),                                     \
-                               [e](const std::pair<ENUM_TYPE, BasicJsonType>& ej_pair) -> bool \
-        {                                                                                      \
-            return ej_pair.first == e;                                                         \
-        });                                                                                    \
-        j = ((it != std::end(m)) ? it : std::begin(m))->second;                                \
-    }                                                                                          \
-    template<typename BasicJsonType>                                                           \
-    inline void from_json(const BasicJsonType& j, ENUM_TYPE& e)                                \
-    {                                                                                          \
-        static_assert(std::is_enum<ENUM_TYPE>::value, #ENUM_TYPE " must be an enum!");         \
-        static const std::pair<ENUM_TYPE, BasicJsonType> m[] = __VA_ARGS__;                    \
-        auto it = std::find_if(std::begin(m), std::end(m),                                     \
-                               [j](const std::pair<ENUM_TYPE, BasicJsonType>& ej_pair) -> bool \
-        {                                                                                      \
-            return ej_pair.second == j;                                                        \
-        });                                                                                    \
-        e = ((it != std::end(m)) ? it : std::begin(m))->first;                                 \
+#define NLOHMANN_JSON_SERIALIZE_ENUM(ENUM_TYPE, ...)                                            \
+    template<typename BasicJsonType>                                                            \
+    inline void to_json(BasicJsonType& j, const ENUM_TYPE& e)                                   \
+    {                                                                                           \
+        static_assert(std::is_enum<ENUM_TYPE>::value, #ENUM_TYPE " must be an enum!");          \
+        static const std::pair<ENUM_TYPE, BasicJsonType> m[] = __VA_ARGS__;                     \
+        auto it = std::find_if(std::begin(m), std::end(m),                                      \
+                               [e](const std::pair<ENUM_TYPE, BasicJsonType>& ej_pair) -> bool  \
+        {                                                                                       \
+            return ej_pair.first == e;                                                          \
+        });                                                                                     \
+        j = ((it != std::end(m)) ? it : std::begin(m))->second;                                 \
+    }                                                                                           \
+    template<typename BasicJsonType>                                                            \
+    inline void from_json(const BasicJsonType& j, ENUM_TYPE& e)                                 \
+    {                                                                                           \
+        static_assert(std::is_enum<ENUM_TYPE>::value, #ENUM_TYPE " must be an enum!");          \
+        static const std::pair<ENUM_TYPE, BasicJsonType> m[] = __VA_ARGS__;                     \
+        auto it = std::find_if(std::begin(m), std::end(m),                                      \
+                               [&j](const std::pair<ENUM_TYPE, BasicJsonType>& ej_pair) -> bool \
+        {                                                                                       \
+            return ej_pair.second == j;                                                         \
+        });                                                                                     \
+        e = ((it != std::end(m)) ? it : std::begin(m))->first;                                  \
    }

 // Ugly macros to avoid uglier copy-paste when specializing basic_json. They
--- a/include/nlohmann/detail/meta/type_traits.hpp
+++ b/include/nlohmann/detail/meta/type_traits.hpp
@ -357,5 +357,18 @@ struct is_compatible_type_impl <
 template <typename BasicJsonType, typename CompatibleType>
 struct is_compatible_type
    : is_compatible_type_impl<BasicJsonType, CompatibleType> {};
+
+// https://en.cppreference.com/w/cpp/types/conjunction
+template<class...> struct conjunction : std::true_type { };
+template<class B1> struct conjunction<B1> : B1 { };
+template<class B1, class... Bn>
+struct conjunction<B1, Bn...>
+: std::conditional<bool(B1::value), conjunction<Bn...>, B1>::type {};
+
+template <typename T1, typename T2>
+struct is_constructible_tuple : std::false_type {};
+
+template <typename T1, typename... Args>
+struct is_constructible_tuple<T1, std::tuple<Args...>> : conjunction<std::is_constructible<T1, Args>...> {};
 }  // namespace detail
 }  // namespace nlohmann
--- a/include/nlohmann/detail/output/binary_writer.hpp
+++ b/include/nlohmann/detail/output/binary_writer.hpp
@ -861,13 +861,12 @@ class binary_writer
    */
    static std::size_t calc_bson_array_size(const typename BasicJsonType::array_t& value)
    {
-        std::size_t embedded_document_size = 0ul;
        std::size_t array_index = 0ul;

-        for (const auto& el : value)
+        const std::size_t embedded_document_size = std::accumulate(std::begin(value), std::end(value), 0ul, [&array_index](std::size_t result, const typename BasicJsonType::array_t::value_type & el)
        {
-            embedded_document_size += calc_bson_element_size(std::to_string(array_index++), el);
-        }
+            return result + calc_bson_element_size(std::to_string(array_index++), el);
+        });

        return sizeof(std::int32_t) + embedded_document_size + 1ul;
    }
--- a/include/nlohmann/detail/output/serializer.hpp
+++ b/include/nlohmann/detail/output/serializer.hpp
@ -630,7 +630,7 @@ class serializer
        if (is_negative)
        {
            *buffer_ptr = '-';
-            abs_value = static_cast<number_unsigned_t>(std::abs(static_cast<std::intmax_t>(x)));
+            abs_value = remove_sign(x);

            // account one more byte for the minus sign
            n_chars = 1 + count_digits(abs_value);
@ -811,6 +811,32 @@ class serializer
        return state;
    }

+    /*
+     * Overload to make the compiler happy while it is instantiating
+     * dump_integer for number_unsigned_t.
+     * Must never be called.
+     */
+    number_unsigned_t remove_sign(number_unsigned_t x)
+    {
+        assert(false); // LCOV_EXCL_LINE
+        return x; // LCOV_EXCL_LINE
+    }
+
+    /*
+     * Helper function for dump_integer
+     *
+     * This function takes a negative signed integer and returns its absolute
+     * value as unsigned integer. The plus/minus shuffling is necessary as we can
+     * not directly remove the sign of an arbitrary signed integer as the
+     * absolute values of INT_MIN and INT_MAX are usually not the same. See
+     * #1708 for details.
+     */
+    inline number_unsigned_t remove_sign(number_integer_t x) noexcept
+    {
+        assert(x < 0 and x < (std::numeric_limits<number_integer_t>::max)());
+        return static_cast<number_unsigned_t>(-(x + 1)) + 1;
+    }
+
  private:
    /// the output of the serializer
    output_adapter_t<char> o = nullptr;
--- a/include/nlohmann/json.hpp
+++ b/include/nlohmann/json.hpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
@ -32,7 +32,7 @@ SOFTWARE.

 #define NLOHMANN_JSON_VERSION_MAJOR 3
 #define NLOHMANN_JSON_VERSION_MINOR 7
-#define NLOHMANN_JSON_VERSION_PATCH 0
+#define NLOHMANN_JSON_VERSION_PATCH 1

 #include <algorithm> // all_of, find, for_each
 #include <cassert> // assert
@ -953,7 +953,7 @@ class basic_json
                    object = nullptr;  // silence warning, see #821
                    if (JSON_HEDLEY_UNLIKELY(t == value_t::null))
                    {
-                        JSON_THROW(other_error::create(500, "961c151d2e87f2686a955a9be24d316f1362bf21 3.7.0")); // LCOV_EXCL_LINE
+                        JSON_THROW(other_error::create(500, "961c151d2e87f2686a955a9be24d316f1362bf21 3.7.1")); // LCOV_EXCL_LINE
                    }
                    break;
                }
@ -2633,11 +2633,11 @@ class basic_json
                                 detail::has_non_default_from_json<basic_json_t, ValueType>::value,
                                 int> = 0>
    ValueType get() const noexcept(noexcept(
-                                       JSONSerializer<ValueTypeCV>::from_json(std::declval<const basic_json_t&>())))
+                                       JSONSerializer<ValueType>::from_json(std::declval<const basic_json_t&>())))
    {
        static_assert(not std::is_reference<ValueTypeCV>::value,
                      "get() cannot be used with reference types, you might want to use get_ref()");
-        return JSONSerializer<ValueTypeCV>::from_json(*this);
+        return JSONSerializer<ValueType>::from_json(*this);
    }

    /*!
@ -4010,7 +4010,7 @@ class basic_json
    @since version 3.6.0
    */
    template<typename KeyT, typename std::enable_if<
-                 not std::is_same<KeyT, json_pointer>::value, int>::type = 0>
+                 not std::is_same<typename std::decay<KeyT>::type, json_pointer>::value, int>::type = 0>
    bool contains(KeyT && key) const
    {
        return is_object() and m_value.object->find(std::forward<KeyT>(key)) != m_value.object->end();
@ -4019,7 +4019,7 @@ class basic_json
    /*!
    @brief check the existence of an element in a JSON object given a JSON pointer

-    Check wehther the given JSON pointer @a ptr can be resolved in the current
+    Check whether the given JSON pointer @a ptr can be resolved in the current
    JSON value.

    @note This method can be executed on any JSON value type.
@ -8062,7 +8062,7 @@ struct hash<nlohmann::json>
 /// @note: do not remove the space after '<',
 ///        see https://github.com/nlohmann/json/pull/679
 template<>
-struct less< ::nlohmann::detail::value_t>
+struct less<::nlohmann::detail::value_t>
 {
    /*!
    @brief compare two value_t enum values
--- a/include/nlohmann/thirdparty/hedley/hedley.hpp
+++ b/include/nlohmann/thirdparty/hedley/hedley.hpp
@ -10,11 +10,11 @@
 * SPDX-License-Identifier: CC0-1.0
 */

-#if !defined(JSON_HEDLEY_VERSION) || (JSON_HEDLEY_VERSION < 9)
+#if !defined(JSON_HEDLEY_VERSION) || (JSON_HEDLEY_VERSION < 11)
 #if defined(JSON_HEDLEY_VERSION)
    #undef JSON_HEDLEY_VERSION
 #endif
-#define JSON_HEDLEY_VERSION 9
+#define JSON_HEDLEY_VERSION 11

 #if defined(JSON_HEDLEY_STRINGIFY_EX)
    #undef JSON_HEDLEY_STRINGIFY_EX
@ -381,12 +381,29 @@
 #if defined(JSON_HEDLEY_HAS_CPP_ATTRIBUTE)
    #undef JSON_HEDLEY_HAS_CPP_ATTRIBUTE
 #endif
-#if defined(__has_cpp_attribute) && defined(__cplusplus)
+#if \
+    defined(__has_cpp_attribute) && \
+    defined(__cplusplus) && \
+    (!defined(JSON_HEDLEY_SUNPRO_VERSION) || JSON_HEDLEY_SUNPRO_VERSION_CHECK(5,15,0))
    #define JSON_HEDLEY_HAS_CPP_ATTRIBUTE(attribute) __has_cpp_attribute(attribute)
 #else
    #define JSON_HEDLEY_HAS_CPP_ATTRIBUTE(attribute) (0)
 #endif

+#if defined(JSON_HEDLEY_HAS_CPP_ATTRIBUTE_NS)
+    #undef JSON_HEDLEY_HAS_CPP_ATTRIBUTE_NS
+#endif
+#if !defined(__cplusplus) || !defined(__has_cpp_attribute)
+    #define JSON_HEDLEY_HAS_CPP_ATTRIBUTE_NS(ns,attribute) (0)
+#elif \
+    !defined(JSON_HEDLEY_PGI_VERSION) && \
+    (!defined(JSON_HEDLEY_SUNPRO_VERSION) || JSON_HEDLEY_SUNPRO_VERSION_CHECK(5,15,0)) && \
+    (!defined(JSON_HEDLEY_MSVC_VERSION) || JSON_HEDLEY_MSVC_VERSION_CHECK(19,20,0))
+    #define JSON_HEDLEY_HAS_CPP_ATTRIBUTE_NS(ns,attribute) JSON_HEDLEY_HAS_CPP_ATTRIBUTE(ns::attribute)
+#else
+    #define JSON_HEDLEY_HAS_CPP_ATTRIBUTE_NS(ns,attribute) (0)
+#endif
+
 #if defined(JSON_HEDLEY_GNUC_HAS_CPP_ATTRIBUTE)
    #undef JSON_HEDLEY_GNUC_HAS_CPP_ATTRIBUTE
 #endif
@ -540,6 +557,21 @@
    #define JSON_HEDLEY_GCC_HAS_WARNING(warning,major,minor,patch) JSON_HEDLEY_GCC_VERSION_CHECK(major,minor,patch)
 #endif

+/* JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_ is for
+   HEDLEY INTERNAL USE ONLY.  API subject to change without notice. */
+#if defined(JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_)
+    #undef JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_
+#endif
+#if defined(__cplusplus) && JSON_HEDLEY_HAS_WARNING("-Wc++98-compat")
+#  define JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_(xpr) \
+    JSON_HEDLEY_DIAGNOSTIC_PUSH \
+    _Pragma("clang diagnostic ignored \"-Wc++98-compat\"") \
+    xpr \
+    JSON_HEDLEY_DIAGNOSTIC_POP
+#else
+#  define JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_(x) x
+#endif
+
 #if \
    (defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)) || \
    defined(__clang__) || \
@ -640,6 +672,27 @@
    #define JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_PRAGMAS
 #endif

+#if defined(JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_CPP_ATTRIBUTES)
+    #undef JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_CPP_ATTRIBUTES
+#endif
+#if JSON_HEDLEY_HAS_WARNING("-Wunknown-attributes")
+    #define JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_CPP_ATTRIBUTES _Pragma("clang diagnostic ignored \"-Wunknown-attributes\"")
+#elif JSON_HEDLEY_GCC_VERSION_CHECK(4,6,0)
+    #define JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_CPP_ATTRIBUTES _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")
+#elif JSON_HEDLEY_INTEL_VERSION_CHECK(17,0,0)
+    #define JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_CPP_ATTRIBUTES _Pragma("warning(disable:1292)")
+#elif JSON_HEDLEY_MSVC_VERSION_CHECK(19,0,0)
+    #define JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_CPP_ATTRIBUTES __pragma(warning(disable:5030))
+#elif JSON_HEDLEY_PGI_VERSION_CHECK(17,10,0)
+    #define JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_CPP_ATTRIBUTES _Pragma("diag_suppress 1097")
+#elif JSON_HEDLEY_SUNPRO_VERSION_CHECK(5,14,0) && defined(__cplusplus)
+    #define JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_CPP_ATTRIBUTES _Pragma("error_messages(off,attrskipunsup)")
+#elif JSON_HEDLEY_TI_VERSION_CHECK(8,0,0)
+    #define JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_CPP_ATTRIBUTES _Pragma("diag_suppress 1173")
+#else
+    #define JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_CPP_ATTRIBUTES
+#endif
+
 #if defined(JSON_HEDLEY_DIAGNOSTIC_DISABLE_CAST_QUAL)
    #undef JSON_HEDLEY_DIAGNOSTIC_DISABLE_CAST_QUAL
 #endif
@ -660,8 +713,8 @@
    #undef JSON_HEDLEY_DEPRECATED_FOR
 #endif
 #if defined(__cplusplus) && (__cplusplus >= 201402L)
-    #define JSON_HEDLEY_DEPRECATED(since) [[deprecated("Since " #since)]]
-    #define JSON_HEDLEY_DEPRECATED_FOR(since, replacement) [[deprecated("Since " #since "; use " #replacement)]]
+    #define JSON_HEDLEY_DEPRECATED(since) JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_([[deprecated("Since " #since)]])
+    #define JSON_HEDLEY_DEPRECATED_FOR(since, replacement) JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_([[deprecated("Since " #since "; use " #replacement)]])
 #elif \
    JSON_HEDLEY_HAS_EXTENSION(attribute_deprecated_with_message) || \
    JSON_HEDLEY_GCC_VERSION_CHECK(4,5,0) || \
@ -686,7 +739,7 @@
 #elif \
    JSON_HEDLEY_MSVC_VERSION_CHECK(13,10,0) || \
    JSON_HEDLEY_PELLES_VERSION_CHECK(6,50,0)
-    #define JSON_HEDLEY_DEPRECATED(since) _declspec(deprecated)
+    #define JSON_HEDLEY_DEPRECATED(since) __declspec(deprecated)
    #define JSON_HEDLEY_DEPRECATED_FOR(since, replacement) __declspec(deprecated)
 #elif JSON_HEDLEY_IAR_VERSION_CHECK(8,0,0)
    #define JSON_HEDLEY_DEPRECATED(since) _Pragma("deprecated")
@ -712,7 +765,7 @@
    #undef JSON_HEDLEY_WARN_UNUSED_RESULT
 #endif
 #if defined(__cplusplus) && (__cplusplus >= 201703L)
-    #define JSON_HEDLEY_WARN_UNUSED_RESULT [[nodiscard]]
+    #define JSON_HEDLEY_WARN_UNUSED_RESULT JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_([[nodiscard]])
 #elif \
    JSON_HEDLEY_HAS_ATTRIBUTE(warn_unused_result) || \
    JSON_HEDLEY_GCC_VERSION_CHECK(3,4,0) || \
@ -751,7 +804,7 @@
 #elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
    #define JSON_HEDLEY_NO_RETURN _Noreturn
 #elif defined(__cplusplus) && (__cplusplus >= 201103L)
-    #define JSON_HEDLEY_NO_RETURN [[noreturn]]
+    #define JSON_HEDLEY_NO_RETURN JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_([[noreturn]])
 #elif \
    JSON_HEDLEY_HAS_ATTRIBUTE(noreturn) || \
    JSON_HEDLEY_GCC_VERSION_CHECK(3,2,0) || \
@ -761,6 +814,8 @@
    JSON_HEDLEY_TI_VERSION_CHECK(18,0,0) || \
    (JSON_HEDLEY_TI_VERSION_CHECK(17,3,0) && defined(__TI_GNU_ATTRIBUTE_SUPPORT__))
    #define JSON_HEDLEY_NO_RETURN __attribute__((__noreturn__))
+#elif JSON_HEDLEY_SUNPRO_VERSION_CHECK(5,10,0)
+    #define JSON_HEDLEY_NO_RETURN _Pragma("does_not_return")
 #elif JSON_HEDLEY_MSVC_VERSION_CHECK(13,10,0)
    #define JSON_HEDLEY_NO_RETURN __declspec(noreturn)
 #elif JSON_HEDLEY_TI_VERSION_CHECK(6,0,0) && defined(__cplusplus)
@ -773,6 +828,15 @@
    #define JSON_HEDLEY_NO_RETURN
 #endif

+#if defined(JSON_HEDLEY_NO_ESCAPE)
+    #undef JSON_HEDLEY_NO_ESCAPE
+#endif
+#if JSON_HEDLEY_HAS_ATTRIBUTE(noescape)
+    #define JSON_HEDLEY_NO_ESCAPE __attribute__((__noescape__))
+#else
+    #define JSON_HEDLEY_NO_ESCAPE
+#endif
+
 #if defined(JSON_HEDLEY_UNREACHABLE)
    #undef JSON_HEDLEY_UNREACHABLE
 #endif
@ -829,11 +893,14 @@
    #define JSON_HEDLEY_ASSUME(expr) ((void) (expr))
 #endif

-
 JSON_HEDLEY_DIAGNOSTIC_PUSH
-#if \
-    JSON_HEDLEY_HAS_WARNING("-Wvariadic-macros") || \
-    JSON_HEDLEY_GCC_VERSION_CHECK(4,0,0)
+#if JSON_HEDLEY_HAS_WARNING("-Wpedantic")
+    #pragma clang diagnostic ignored "-Wpedantic"
+#endif
+#if JSON_HEDLEY_HAS_WARNING("-Wc++98-compat-pedantic") && defined(__cplusplus)
+    #pragma clang diagnostic ignored "-Wc++98-compat-pedantic"
+#endif
+#if JSON_HEDLEY_GCC_HAS_WARNING("-Wvariadic-macros",4,0,0)
    #if defined(__clang__)
        #pragma clang diagnostic ignored "-Wvariadic-macros"
    #elif defined(JSON_HEDLEY_GCC_VERSION)
@ -881,7 +948,7 @@ JSON_HEDLEY_DIAGNOSTIC_POP
 #endif
 #if defined(__cplusplus)
    #if __cplusplus >= 201103L
-        #define JSON_HEDLEY_CONSTEXPR constexpr
+        #define JSON_HEDLEY_CONSTEXPR JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_(constexpr)
    #endif
 #endif
 #if !defined(JSON_HEDLEY_CONSTEXPR)
@ -961,6 +1028,8 @@ JSON_HEDLEY_DIAGNOSTIC_POP
    JSON_HEDLEY_TI_VERSION_CHECK(8,0,0) || \
    (JSON_HEDLEY_TI_VERSION_CHECK(7,3,0) && defined(__TI_GNU_ATTRIBUTE_SUPPORT__))
    #define JSON_HEDLEY_MALLOC __attribute__((__malloc__))
+#elif JSON_HEDLEY_SUNPRO_VERSION_CHECK(5,10,0)
+    #define JSON_HEDLEY_MALLOC _Pragma("returns_new_memory")
 #elif JSON_HEDLEY_MSVC_VERSION_CHECK(14, 0, 0)
    #define JSON_HEDLEY_MALLOC __declspec(restrict)
 #else
@ -981,6 +1050,8 @@ JSON_HEDLEY_DIAGNOSTIC_POP
    (JSON_HEDLEY_TI_VERSION_CHECK(7,3,0) && defined(__TI_GNU_ATTRIBUTE_SUPPORT__)) || \
    JSON_HEDLEY_PGI_VERSION_CHECK(17,10,0)
    #define JSON_HEDLEY_PURE __attribute__((__pure__))
+#elif JSON_HEDLEY_SUNPRO_VERSION_CHECK(5,10,0)
+    #define JSON_HEDLEY_PURE _Pragma("does_not_write_global_data")
 #elif JSON_HEDLEY_TI_VERSION_CHECK(6,0,0) && defined(__cplusplus)
    #define JSON_HEDLEY_PURE _Pragma("FUNC_IS_PURE;")
 #else
@ -1001,6 +1072,9 @@ JSON_HEDLEY_DIAGNOSTIC_POP
    (JSON_HEDLEY_TI_VERSION_CHECK(7,3,0) && defined(__TI_GNU_ATTRIBUTE_SUPPORT__)) || \
    JSON_HEDLEY_PGI_VERSION_CHECK(17,10,0)
    #define JSON_HEDLEY_CONST __attribute__((__const__))
+#elif \
+    JSON_HEDLEY_SUNPRO_VERSION_CHECK(5,10,0)
+    #define JSON_HEDLEY_CONST _Pragma("no_side_effect")
 #else
    #define JSON_HEDLEY_CONST JSON_HEDLEY_PURE
 #endif
@ -1151,28 +1225,16 @@ JSON_HEDLEY_DIAGNOSTIC_POP
 #if defined(JSON_HEDLEY_FALL_THROUGH)
    #undef JSON_HEDLEY_FALL_THROUGH
 #endif
-#if \
-    defined(__cplusplus) && \
-    (!defined(JSON_HEDLEY_SUNPRO_VERSION) || JSON_HEDLEY_SUNPRO_VERSION_CHECK(5,15,0)) && \
-    !defined(JSON_HEDLEY_PGI_VERSION)
-    #if \
-        (__cplusplus >= 201703L) || \
-        ((__cplusplus >= 201103L) && JSON_HEDLEY_HAS_CPP_ATTRIBUTE(fallthrough))
-        #define JSON_HEDLEY_FALL_THROUGH [[fallthrough]]
-    #elif (__cplusplus >= 201103L) && JSON_HEDLEY_HAS_CPP_ATTRIBUTE(clang::fallthrough)
-        #define JSON_HEDLEY_FALL_THROUGH [[clang::fallthrough]]
-    #elif (__cplusplus >= 201103L) && JSON_HEDLEY_GCC_VERSION_CHECK(7,0,0)
-        #define JSON_HEDLEY_FALL_THROUGH [[gnu::fallthrough]]
-    #endif
-#endif
-#if !defined(JSON_HEDLEY_FALL_THROUGH)
-    #if JSON_HEDLEY_GNUC_HAS_ATTRIBUTE(fallthrough,7,0,0) && !defined(JSON_HEDLEY_PGI_VERSION)
-        #define JSON_HEDLEY_FALL_THROUGH __attribute__((__fallthrough__))
-    #elif defined(__fallthrough) /* SAL */
-        #define JSON_HEDLEY_FALL_THROUGH __fallthrough
-    #else
-        #define JSON_HEDLEY_FALL_THROUGH
-    #endif
+#if JSON_HEDLEY_GNUC_HAS_ATTRIBUTE(fallthrough,7,0,0) && !defined(JSON_HEDLEY_PGI_VERSION)
+    #define JSON_HEDLEY_FALL_THROUGH __attribute__((__fallthrough__))
+#elif JSON_HEDLEY_HAS_CPP_ATTRIBUTE_NS(clang,fallthrough)
+    #define JSON_HEDLEY_FALL_THROUGH JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_([[clang::fallthrough]])
+#elif JSON_HEDLEY_HAS_CPP_ATTRIBUTE(fallthrough)
+    #define JSON_HEDLEY_FALL_THROUGH JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_([[fallthrough]])
+#elif defined(__fallthrough) /* SAL */
+    #define JSON_HEDLEY_FALL_THROUGH __fallthrough
+#else
+    #define JSON_HEDLEY_FALL_THROUGH
 #endif

 #if defined(JSON_HEDLEY_RETURNS_NON_NULL)
@ -1208,12 +1270,11 @@ JSON_HEDLEY_DIAGNOSTIC_POP
 #if defined(JSON_HEDLEY_REQUIRE_CONSTEXPR)
    #undef JSON_HEDLEY_REQUIRE_CONSTEXPR
 #endif
-/* Note the double-underscore. For internal use only; no API
- * guarantees! */
-#if defined(JSON_HEDLEY__IS_CONSTEXPR)
-    #undef JSON_HEDLEY__IS_CONSTEXPR
+/* JSON_HEDLEY_IS_CONSTEXPR_ is for
+   HEDLEY INTERNAL USE ONLY.  API subject to change without notice. */
+#if defined(JSON_HEDLEY_IS_CONSTEXPR_)
+    #undef JSON_HEDLEY_IS_CONSTEXPR_
 #endif
-
 #if \
    JSON_HEDLEY_HAS_BUILTIN(__builtin_constant_p) || \
    JSON_HEDLEY_GCC_VERSION_CHECK(3,4,0) || \
@ -1222,7 +1283,7 @@ JSON_HEDLEY_DIAGNOSTIC_POP
    JSON_HEDLEY_ARM_VERSION_CHECK(4,1,0) || \
    JSON_HEDLEY_IBM_VERSION_CHECK(13,1,0) || \
    JSON_HEDLEY_TI_VERSION_CHECK(6,1,0) || \
-    JSON_HEDLEY_SUNPRO_VERSION_CHECK(5,10,0) || \
+    (JSON_HEDLEY_SUNPRO_VERSION_CHECK(5,10,0) && !defined(__cplusplus)) || \
    JSON_HEDLEY_CRAY_VERSION_CHECK(8,1,0)
    #define JSON_HEDLEY_IS_CONSTANT(expr) __builtin_constant_p(expr)
 #endif
@ -1236,10 +1297,10 @@ JSON_HEDLEY_DIAGNOSTIC_POP
       JSON_HEDLEY_ARM_VERSION_CHECK(5,4,0) || \
       JSON_HEDLEY_TINYC_VERSION_CHECK(0,9,24)
 #if defined(__INTPTR_TYPE__)
-    #define JSON_HEDLEY__IS_CONSTEXPR(expr) __builtin_types_compatible_p(__typeof__((1 ? (void*) ((__INTPTR_TYPE__) ((expr) * 0)) : (int*) 0)), int*)
+    #define JSON_HEDLEY_IS_CONSTEXPR_(expr) __builtin_types_compatible_p(__typeof__((1 ? (void*) ((__INTPTR_TYPE__) ((expr) * 0)) : (int*) 0)), int*)
 #else
    #include <stdint.h>
-    #define JSON_HEDLEY__IS_CONSTEXPR(expr) __builtin_types_compatible_p(__typeof__((1 ? (void*) ((intptr_t) ((expr) * 0)) : (int*) 0)), int*)
+    #define JSON_HEDLEY_IS_CONSTEXPR_(expr) __builtin_types_compatible_p(__typeof__((1 ? (void*) ((intptr_t) ((expr) * 0)) : (int*) 0)), int*)
 #endif
 #  elif \
       (defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L) && !defined(JSON_HEDLEY_SUNPRO_VERSION) && !defined(JSON_HEDLEY_PGI_VERSION)) || \
@ -1249,10 +1310,10 @@ JSON_HEDLEY_DIAGNOSTIC_POP
       JSON_HEDLEY_IBM_VERSION_CHECK(12,1,0) || \
       JSON_HEDLEY_ARM_VERSION_CHECK(5,3,0)
 #if defined(__INTPTR_TYPE__)
-    #define JSON_HEDLEY__IS_CONSTEXPR(expr) _Generic((1 ? (void*) ((__INTPTR_TYPE__) ((expr) * 0)) : (int*) 0), int*: 1, void*: 0)
+    #define JSON_HEDLEY_IS_CONSTEXPR_(expr) _Generic((1 ? (void*) ((__INTPTR_TYPE__) ((expr) * 0)) : (int*) 0), int*: 1, void*: 0)
 #else
    #include <stdint.h>
-    #define JSON_HEDLEY__IS_CONSTEXPR(expr) _Generic((1 ? (void*) ((intptr_t) * 0) : (int*) 0), int*: 1, void*: 0)
+    #define JSON_HEDLEY_IS_CONSTEXPR_(expr) _Generic((1 ? (void*) ((intptr_t) * 0) : (int*) 0), int*: 1, void*: 0)
 #endif
 #  elif \
       defined(JSON_HEDLEY_GCC_VERSION) || \
@ -1260,7 +1321,7 @@ JSON_HEDLEY_DIAGNOSTIC_POP
       defined(JSON_HEDLEY_TINYC_VERSION) || \
       defined(JSON_HEDLEY_TI_VERSION) || \
       defined(__clang__)
-#    define JSON_HEDLEY__IS_CONSTEXPR(expr) ( \
+#    define JSON_HEDLEY_IS_CONSTEXPR_(expr) ( \
        sizeof(void) != \
        sizeof(*( \
                  1 ? \
@ -1271,11 +1332,11 @@ JSON_HEDLEY_DIAGNOSTIC_POP
                                            )
 #  endif
 #endif
-#if defined(JSON_HEDLEY__IS_CONSTEXPR)
+#if defined(JSON_HEDLEY_IS_CONSTEXPR_)
    #if !defined(JSON_HEDLEY_IS_CONSTANT)
-        #define JSON_HEDLEY_IS_CONSTANT(expr) JSON_HEDLEY__IS_CONSTEXPR(expr)
+        #define JSON_HEDLEY_IS_CONSTANT(expr) JSON_HEDLEY_IS_CONSTEXPR_(expr)
    #endif
-    #define JSON_HEDLEY_REQUIRE_CONSTEXPR(expr) (JSON_HEDLEY__IS_CONSTEXPR(expr) ? (expr) : (-1))
+    #define JSON_HEDLEY_REQUIRE_CONSTEXPR(expr) (JSON_HEDLEY_IS_CONSTEXPR_(expr) ? (expr) : (-1))
 #else
    #if !defined(JSON_HEDLEY_IS_CONSTANT)
        #define JSON_HEDLEY_IS_CONSTANT(expr) (0)
@ -1315,12 +1376,10 @@ JSON_HEDLEY_DIAGNOSTIC_POP
    )
 #  define JSON_HEDLEY_STATIC_ASSERT(expr, message) _Static_assert(expr, message)
 #elif \
-  (defined(__cplusplus) && (__cplusplus >= 201703L)) || \
+  (defined(__cplusplus) && (__cplusplus >= 201103L)) || \
  JSON_HEDLEY_MSVC_VERSION_CHECK(16,0,0) || \
  (defined(__cplusplus) && JSON_HEDLEY_TI_VERSION_CHECK(8,3,0))
-#  define JSON_HEDLEY_STATIC_ASSERT(expr, message) static_assert(expr, message)
-#elif defined(__cplusplus) && (__cplusplus >= 201103L)
-#  define JSON_HEDLEY_STATIC_ASSERT(expr, message) static_assert(expr)
+#  define JSON_HEDLEY_STATIC_ASSERT(expr, message) JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_(static_assert(expr, message))
 #else
 #  define JSON_HEDLEY_STATIC_ASSERT(expr, message)
 #endif
@ -1371,6 +1430,23 @@ JSON_HEDLEY_DIAGNOSTIC_POP
    #define JSON_HEDLEY_CPP_CAST(T, expr) (expr)
 #endif

+#if defined(JSON_HEDLEY_NULL)
+    #undef JSON_HEDLEY_NULL
+#endif
+#if defined(__cplusplus)
+    #if __cplusplus >= 201103L
+        #define JSON_HEDLEY_NULL JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_(nullptr)
+    #elif defined(NULL)
+        #define JSON_HEDLEY_NULL NULL
+    #else
+        #define JSON_HEDLEY_NULL JSON_HEDLEY_STATIC_CAST(void*, 0)
+    #endif
+#elif defined(NULL)
+    #define JSON_HEDLEY_NULL NULL
+#else
+    #define JSON_HEDLEY_NULL ((void*) 0)
+#endif
+
 #if defined(JSON_HEDLEY_MESSAGE)
    #undef JSON_HEDLEY_MESSAGE
 #endif
@ -1413,28 +1489,33 @@ JSON_HEDLEY_DIAGNOSTIC_POP
 #  define JSON_HEDLEY_WARNING(msg) JSON_HEDLEY_MESSAGE(msg)
 #endif

+#if defined(JSON_HEDLEY_REQUIRE)
+    #undef JSON_HEDLEY_REQUIRE
+#endif
 #if defined(JSON_HEDLEY_REQUIRE_MSG)
    #undef JSON_HEDLEY_REQUIRE_MSG
 #endif
 #if JSON_HEDLEY_HAS_ATTRIBUTE(diagnose_if)
 #  if JSON_HEDLEY_HAS_WARNING("-Wgcc-compat")
-#    define JSON_HEDLEY_REQUIRE_MSG(expr, msg) \
+#    define JSON_HEDLEY_REQUIRE(expr) \
    JSON_HEDLEY_DIAGNOSTIC_PUSH \
    _Pragma("clang diagnostic ignored \"-Wgcc-compat\"") \
-    __attribute__((__diagnose_if__(!(expr), msg, "error"))) \
+    __attribute__((diagnose_if(!(expr), #expr, "error"))) \
+    JSON_HEDLEY_DIAGNOSTIC_POP
+#    define JSON_HEDLEY_REQUIRE_MSG(expr,msg) \
+    JSON_HEDLEY_DIAGNOSTIC_PUSH \
+    _Pragma("clang diagnostic ignored \"-Wgcc-compat\"") \
+    __attribute__((diagnose_if(!(expr), msg, "error"))) \
    JSON_HEDLEY_DIAGNOSTIC_POP
 #  else
-#    define JSON_HEDLEY_REQUIRE_MSG(expr, msg) __attribute__((__diagnose_if__(!(expr), msg, "error")))
+#    define JSON_HEDLEY_REQUIRE(expr) __attribute__((diagnose_if(!(expr), #expr, "error")))
+#    define JSON_HEDLEY_REQUIRE_MSG(expr,msg) __attribute__((diagnose_if(!(expr), msg, "error")))
 #  endif
 #else
-#  define JSON_HEDLEY_REQUIRE_MSG(expr, msg)
+#  define JSON_HEDLEY_REQUIRE(expr)
+#  define JSON_HEDLEY_REQUIRE_MSG(expr,msg)
 #endif

-#if defined(JSON_HEDLEY_REQUIRE)
-    #undef JSON_HEDLEY_REQUIRE
-#endif
-#define JSON_HEDLEY_REQUIRE(expr) JSON_HEDLEY_REQUIRE_MSG(expr, #expr)
-
 #if defined(JSON_HEDLEY_FLAGS)
    #undef JSON_HEDLEY_FLAGS
 #endif
@ -1456,6 +1537,15 @@ JSON_HEDLEY_DIAGNOSTIC_POP
 #  define JSON_HEDLEY_FLAGS_CAST(T, expr) JSON_HEDLEY_STATIC_CAST(T, expr)
 #endif

+#if defined(JSON_HEDLEY_EMPTY_BASES)
+    #undef JSON_HEDLEY_EMPTY_BASES
+#endif
+#if JSON_HEDLEY_MSVC_VERSION_CHECK(19,0,23918) && !JSON_HEDLEY_MSVC_VERSION_CHECK(20,0,0)
+    #define JSON_HEDLEY_EMPTY_BASES __declspec(empty_bases)
+#else
+    #define JSON_HEDLEY_EMPTY_BASES
+#endif
+
 /* Remaining macros are deprecated. */

 #if defined(JSON_HEDLEY_GCC_NOT_CLANG_VERSION_CHECK)
--- a/include/nlohmann/thirdparty/hedley/hedley_undef.hpp
+++ b/include/nlohmann/thirdparty/hedley/hedley_undef.hpp
@ -4,6 +4,7 @@
 #undef JSON_HEDLEY_ARRAY_PARAM
 #undef JSON_HEDLEY_ASSUME
 #undef JSON_HEDLEY_BEGIN_C_DECLS
+#undef JSON_HEDLEY_C_DECL
 #undef JSON_HEDLEY_CLANG_HAS_ATTRIBUTE
 #undef JSON_HEDLEY_CLANG_HAS_BUILTIN
 #undef JSON_HEDLEY_CLANG_HAS_CPP_ATTRIBUTE
@ -16,21 +17,23 @@
 #undef JSON_HEDLEY_CONCAT
 #undef JSON_HEDLEY_CONCAT_EX
 #undef JSON_HEDLEY_CONST
-#undef JSON_HEDLEY_CONSTEXPR
 #undef JSON_HEDLEY_CONST_CAST
+#undef JSON_HEDLEY_CONSTEXPR
 #undef JSON_HEDLEY_CPP_CAST
 #undef JSON_HEDLEY_CRAY_VERSION
 #undef JSON_HEDLEY_CRAY_VERSION_CHECK
-#undef JSON_HEDLEY_C_DECL
 #undef JSON_HEDLEY_DEPRECATED
 #undef JSON_HEDLEY_DEPRECATED_FOR
 #undef JSON_HEDLEY_DIAGNOSTIC_DISABLE_CAST_QUAL
+#undef JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_
 #undef JSON_HEDLEY_DIAGNOSTIC_DISABLE_DEPRECATED
+#undef JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_CPP_ATTRIBUTES
 #undef JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_PRAGMAS
 #undef JSON_HEDLEY_DIAGNOSTIC_POP
 #undef JSON_HEDLEY_DIAGNOSTIC_PUSH
 #undef JSON_HEDLEY_DMC_VERSION
 #undef JSON_HEDLEY_DMC_VERSION_CHECK
+#undef JSON_HEDLEY_EMPTY_BASES
 #undef JSON_HEDLEY_EMSCRIPTEN_VERSION
 #undef JSON_HEDLEY_EMSCRIPTEN_VERSION_CHECK
 #undef JSON_HEDLEY_END_C_DECLS
@ -59,6 +62,7 @@
 #undef JSON_HEDLEY_HAS_ATTRIBUTE
 #undef JSON_HEDLEY_HAS_BUILTIN
 #undef JSON_HEDLEY_HAS_CPP_ATTRIBUTE
+#undef JSON_HEDLEY_HAS_CPP_ATTRIBUTE_NS
 #undef JSON_HEDLEY_HAS_DECLSPEC_ATTRIBUTE
 #undef JSON_HEDLEY_HAS_EXTENSION
 #undef JSON_HEDLEY_HAS_FEATURE
@ -72,15 +76,18 @@
 #undef JSON_HEDLEY_INTEL_VERSION
 #undef JSON_HEDLEY_INTEL_VERSION_CHECK
 #undef JSON_HEDLEY_IS_CONSTANT
+#undef JSON_HEDLEY_IS_CONSTEXPR_
 #undef JSON_HEDLEY_LIKELY
 #undef JSON_HEDLEY_MALLOC
 #undef JSON_HEDLEY_MESSAGE
 #undef JSON_HEDLEY_MSVC_VERSION
 #undef JSON_HEDLEY_MSVC_VERSION_CHECK
 #undef JSON_HEDLEY_NEVER_INLINE
+#undef JSON_HEDLEY_NO_ESCAPE
 #undef JSON_HEDLEY_NON_NULL
 #undef JSON_HEDLEY_NO_RETURN
 #undef JSON_HEDLEY_NO_THROW
+#undef JSON_HEDLEY_NULL
 #undef JSON_HEDLEY_PELLES_VERSION
 #undef JSON_HEDLEY_PELLES_VERSION_CHECK
 #undef JSON_HEDLEY_PGI_VERSION
--- a/meson.build
+++ b/meson.build
@ -1,6 +1,6 @@
 project('nlohmann_json',
    'cpp',
-    version : '3.7.0',
+    version : '3.7.1',
    license : 'MIT',
 )

--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
@ -32,7 +32,7 @@ SOFTWARE.

 #define NLOHMANN_JSON_VERSION_MAJOR 3
 #define NLOHMANN_JSON_VERSION_MINOR 7
-#define NLOHMANN_JSON_VERSION_PATCH 0
+#define NLOHMANN_JSON_VERSION_PATCH 1

 #include <algorithm> // all_of, find, for_each
 #include <cassert> // assert
@ -122,11 +122,11 @@ struct position_t
 * SPDX-License-Identifier: CC0-1.0
 */

-#if !defined(JSON_HEDLEY_VERSION) || (JSON_HEDLEY_VERSION < 9)
+#if !defined(JSON_HEDLEY_VERSION) || (JSON_HEDLEY_VERSION < 11)
 #if defined(JSON_HEDLEY_VERSION)
    #undef JSON_HEDLEY_VERSION
 #endif
-#define JSON_HEDLEY_VERSION 9
+#define JSON_HEDLEY_VERSION 11

 #if defined(JSON_HEDLEY_STRINGIFY_EX)
    #undef JSON_HEDLEY_STRINGIFY_EX
@ -493,12 +493,29 @@ struct position_t
 #if defined(JSON_HEDLEY_HAS_CPP_ATTRIBUTE)
    #undef JSON_HEDLEY_HAS_CPP_ATTRIBUTE
 #endif
-#if defined(__has_cpp_attribute) && defined(__cplusplus)
+#if \
+    defined(__has_cpp_attribute) && \
+    defined(__cplusplus) && \
+    (!defined(JSON_HEDLEY_SUNPRO_VERSION) || JSON_HEDLEY_SUNPRO_VERSION_CHECK(5,15,0))
    #define JSON_HEDLEY_HAS_CPP_ATTRIBUTE(attribute) __has_cpp_attribute(attribute)
 #else
    #define JSON_HEDLEY_HAS_CPP_ATTRIBUTE(attribute) (0)
 #endif

+#if defined(JSON_HEDLEY_HAS_CPP_ATTRIBUTE_NS)
+    #undef JSON_HEDLEY_HAS_CPP_ATTRIBUTE_NS
+#endif
+#if !defined(__cplusplus) || !defined(__has_cpp_attribute)
+    #define JSON_HEDLEY_HAS_CPP_ATTRIBUTE_NS(ns,attribute) (0)
+#elif \
+    !defined(JSON_HEDLEY_PGI_VERSION) && \
+    (!defined(JSON_HEDLEY_SUNPRO_VERSION) || JSON_HEDLEY_SUNPRO_VERSION_CHECK(5,15,0)) && \
+    (!defined(JSON_HEDLEY_MSVC_VERSION) || JSON_HEDLEY_MSVC_VERSION_CHECK(19,20,0))
+    #define JSON_HEDLEY_HAS_CPP_ATTRIBUTE_NS(ns,attribute) JSON_HEDLEY_HAS_CPP_ATTRIBUTE(ns::attribute)
+#else
+    #define JSON_HEDLEY_HAS_CPP_ATTRIBUTE_NS(ns,attribute) (0)
+#endif
+
 #if defined(JSON_HEDLEY_GNUC_HAS_CPP_ATTRIBUTE)
    #undef JSON_HEDLEY_GNUC_HAS_CPP_ATTRIBUTE
 #endif
@ -652,6 +669,21 @@ struct position_t
    #define JSON_HEDLEY_GCC_HAS_WARNING(warning,major,minor,patch) JSON_HEDLEY_GCC_VERSION_CHECK(major,minor,patch)
 #endif

+/* JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_ is for
+   HEDLEY INTERNAL USE ONLY.  API subject to change without notice. */
+#if defined(JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_)
+    #undef JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_
+#endif
+#if defined(__cplusplus) && JSON_HEDLEY_HAS_WARNING("-Wc++98-compat")
+#  define JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_(xpr) \
+    JSON_HEDLEY_DIAGNOSTIC_PUSH \
+    _Pragma("clang diagnostic ignored \"-Wc++98-compat\"") \
+    xpr \
+    JSON_HEDLEY_DIAGNOSTIC_POP
+#else
+#  define JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_(x) x
+#endif
+
 #if \
    (defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)) || \
    defined(__clang__) || \
@ -752,6 +784,27 @@ struct position_t
    #define JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_PRAGMAS
 #endif

+#if defined(JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_CPP_ATTRIBUTES)
+    #undef JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_CPP_ATTRIBUTES
+#endif
+#if JSON_HEDLEY_HAS_WARNING("-Wunknown-attributes")
+    #define JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_CPP_ATTRIBUTES _Pragma("clang diagnostic ignored \"-Wunknown-attributes\"")
+#elif JSON_HEDLEY_GCC_VERSION_CHECK(4,6,0)
+    #define JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_CPP_ATTRIBUTES _Pragma("GCC diagnostic ignored \"-Wdeprecated-declarations\"")
+#elif JSON_HEDLEY_INTEL_VERSION_CHECK(17,0,0)
+    #define JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_CPP_ATTRIBUTES _Pragma("warning(disable:1292)")
+#elif JSON_HEDLEY_MSVC_VERSION_CHECK(19,0,0)
+    #define JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_CPP_ATTRIBUTES __pragma(warning(disable:5030))
+#elif JSON_HEDLEY_PGI_VERSION_CHECK(17,10,0)
+    #define JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_CPP_ATTRIBUTES _Pragma("diag_suppress 1097")
+#elif JSON_HEDLEY_SUNPRO_VERSION_CHECK(5,14,0) && defined(__cplusplus)
+    #define JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_CPP_ATTRIBUTES _Pragma("error_messages(off,attrskipunsup)")
+#elif JSON_HEDLEY_TI_VERSION_CHECK(8,0,0)
+    #define JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_CPP_ATTRIBUTES _Pragma("diag_suppress 1173")
+#else
+    #define JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_CPP_ATTRIBUTES
+#endif
+
 #if defined(JSON_HEDLEY_DIAGNOSTIC_DISABLE_CAST_QUAL)
    #undef JSON_HEDLEY_DIAGNOSTIC_DISABLE_CAST_QUAL
 #endif
@ -772,8 +825,8 @@ struct position_t
    #undef JSON_HEDLEY_DEPRECATED_FOR
 #endif
 #if defined(__cplusplus) && (__cplusplus >= 201402L)
-    #define JSON_HEDLEY_DEPRECATED(since) [[deprecated("Since " #since)]]
-    #define JSON_HEDLEY_DEPRECATED_FOR(since, replacement) [[deprecated("Since " #since "; use " #replacement)]]
+    #define JSON_HEDLEY_DEPRECATED(since) JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_([[deprecated("Since " #since)]])
+    #define JSON_HEDLEY_DEPRECATED_FOR(since, replacement) JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_([[deprecated("Since " #since "; use " #replacement)]])
 #elif \
    JSON_HEDLEY_HAS_EXTENSION(attribute_deprecated_with_message) || \
    JSON_HEDLEY_GCC_VERSION_CHECK(4,5,0) || \
@ -798,7 +851,7 @@ struct position_t
 #elif \
    JSON_HEDLEY_MSVC_VERSION_CHECK(13,10,0) || \
    JSON_HEDLEY_PELLES_VERSION_CHECK(6,50,0)
-    #define JSON_HEDLEY_DEPRECATED(since) _declspec(deprecated)
+    #define JSON_HEDLEY_DEPRECATED(since) __declspec(deprecated)
    #define JSON_HEDLEY_DEPRECATED_FOR(since, replacement) __declspec(deprecated)
 #elif JSON_HEDLEY_IAR_VERSION_CHECK(8,0,0)
    #define JSON_HEDLEY_DEPRECATED(since) _Pragma("deprecated")
@ -824,7 +877,7 @@ struct position_t
    #undef JSON_HEDLEY_WARN_UNUSED_RESULT
 #endif
 #if defined(__cplusplus) && (__cplusplus >= 201703L)
-    #define JSON_HEDLEY_WARN_UNUSED_RESULT [[nodiscard]]
+    #define JSON_HEDLEY_WARN_UNUSED_RESULT JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_([[nodiscard]])
 #elif \
    JSON_HEDLEY_HAS_ATTRIBUTE(warn_unused_result) || \
    JSON_HEDLEY_GCC_VERSION_CHECK(3,4,0) || \
@ -863,7 +916,7 @@ struct position_t
 #elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
    #define JSON_HEDLEY_NO_RETURN _Noreturn
 #elif defined(__cplusplus) && (__cplusplus >= 201103L)
-    #define JSON_HEDLEY_NO_RETURN [[noreturn]]
+    #define JSON_HEDLEY_NO_RETURN JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_([[noreturn]])
 #elif \
    JSON_HEDLEY_HAS_ATTRIBUTE(noreturn) || \
    JSON_HEDLEY_GCC_VERSION_CHECK(3,2,0) || \
@ -873,6 +926,8 @@ struct position_t
    JSON_HEDLEY_TI_VERSION_CHECK(18,0,0) || \
    (JSON_HEDLEY_TI_VERSION_CHECK(17,3,0) && defined(__TI_GNU_ATTRIBUTE_SUPPORT__))
    #define JSON_HEDLEY_NO_RETURN __attribute__((__noreturn__))
+#elif JSON_HEDLEY_SUNPRO_VERSION_CHECK(5,10,0)
+    #define JSON_HEDLEY_NO_RETURN _Pragma("does_not_return")
 #elif JSON_HEDLEY_MSVC_VERSION_CHECK(13,10,0)
    #define JSON_HEDLEY_NO_RETURN __declspec(noreturn)
 #elif JSON_HEDLEY_TI_VERSION_CHECK(6,0,0) && defined(__cplusplus)
@ -885,6 +940,15 @@ struct position_t
    #define JSON_HEDLEY_NO_RETURN
 #endif

+#if defined(JSON_HEDLEY_NO_ESCAPE)
+    #undef JSON_HEDLEY_NO_ESCAPE
+#endif
+#if JSON_HEDLEY_HAS_ATTRIBUTE(noescape)
+    #define JSON_HEDLEY_NO_ESCAPE __attribute__((__noescape__))
+#else
+    #define JSON_HEDLEY_NO_ESCAPE
+#endif
+
 #if defined(JSON_HEDLEY_UNREACHABLE)
    #undef JSON_HEDLEY_UNREACHABLE
 #endif
@ -941,11 +1005,14 @@ struct position_t
    #define JSON_HEDLEY_ASSUME(expr) ((void) (expr))
 #endif

-
 JSON_HEDLEY_DIAGNOSTIC_PUSH
-#if \
-    JSON_HEDLEY_HAS_WARNING("-Wvariadic-macros") || \
-    JSON_HEDLEY_GCC_VERSION_CHECK(4,0,0)
+#if JSON_HEDLEY_HAS_WARNING("-Wpedantic")
+    #pragma clang diagnostic ignored "-Wpedantic"
+#endif
+#if JSON_HEDLEY_HAS_WARNING("-Wc++98-compat-pedantic") && defined(__cplusplus)
+    #pragma clang diagnostic ignored "-Wc++98-compat-pedantic"
+#endif
+#if JSON_HEDLEY_GCC_HAS_WARNING("-Wvariadic-macros",4,0,0)
    #if defined(__clang__)
        #pragma clang diagnostic ignored "-Wvariadic-macros"
    #elif defined(JSON_HEDLEY_GCC_VERSION)
@ -993,7 +1060,7 @@ JSON_HEDLEY_DIAGNOSTIC_POP
 #endif
 #if defined(__cplusplus)
    #if __cplusplus >= 201103L
-        #define JSON_HEDLEY_CONSTEXPR constexpr
+        #define JSON_HEDLEY_CONSTEXPR JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_(constexpr)
    #endif
 #endif
 #if !defined(JSON_HEDLEY_CONSTEXPR)
@ -1073,6 +1140,8 @@ JSON_HEDLEY_DIAGNOSTIC_POP
    JSON_HEDLEY_TI_VERSION_CHECK(8,0,0) || \
    (JSON_HEDLEY_TI_VERSION_CHECK(7,3,0) && defined(__TI_GNU_ATTRIBUTE_SUPPORT__))
    #define JSON_HEDLEY_MALLOC __attribute__((__malloc__))
+#elif JSON_HEDLEY_SUNPRO_VERSION_CHECK(5,10,0)
+    #define JSON_HEDLEY_MALLOC _Pragma("returns_new_memory")
 #elif JSON_HEDLEY_MSVC_VERSION_CHECK(14, 0, 0)
    #define JSON_HEDLEY_MALLOC __declspec(restrict)
 #else
@ -1093,6 +1162,8 @@ JSON_HEDLEY_DIAGNOSTIC_POP
    (JSON_HEDLEY_TI_VERSION_CHECK(7,3,0) && defined(__TI_GNU_ATTRIBUTE_SUPPORT__)) || \
    JSON_HEDLEY_PGI_VERSION_CHECK(17,10,0)
    #define JSON_HEDLEY_PURE __attribute__((__pure__))
+#elif JSON_HEDLEY_SUNPRO_VERSION_CHECK(5,10,0)
+    #define JSON_HEDLEY_PURE _Pragma("does_not_write_global_data")
 #elif JSON_HEDLEY_TI_VERSION_CHECK(6,0,0) && defined(__cplusplus)
    #define JSON_HEDLEY_PURE _Pragma("FUNC_IS_PURE;")
 #else
@ -1113,6 +1184,9 @@ JSON_HEDLEY_DIAGNOSTIC_POP
    (JSON_HEDLEY_TI_VERSION_CHECK(7,3,0) && defined(__TI_GNU_ATTRIBUTE_SUPPORT__)) || \
    JSON_HEDLEY_PGI_VERSION_CHECK(17,10,0)
    #define JSON_HEDLEY_CONST __attribute__((__const__))
+#elif \
+    JSON_HEDLEY_SUNPRO_VERSION_CHECK(5,10,0)
+    #define JSON_HEDLEY_CONST _Pragma("no_side_effect")
 #else
    #define JSON_HEDLEY_CONST JSON_HEDLEY_PURE
 #endif
@ -1263,28 +1337,16 @@ JSON_HEDLEY_DIAGNOSTIC_POP
 #if defined(JSON_HEDLEY_FALL_THROUGH)
    #undef JSON_HEDLEY_FALL_THROUGH
 #endif
-#if \
-    defined(__cplusplus) && \
-    (!defined(JSON_HEDLEY_SUNPRO_VERSION) || JSON_HEDLEY_SUNPRO_VERSION_CHECK(5,15,0)) && \
-    !defined(JSON_HEDLEY_PGI_VERSION)
-    #if \
-        (__cplusplus >= 201703L) || \
-        ((__cplusplus >= 201103L) && JSON_HEDLEY_HAS_CPP_ATTRIBUTE(fallthrough))
-        #define JSON_HEDLEY_FALL_THROUGH [[fallthrough]]
-    #elif (__cplusplus >= 201103L) && JSON_HEDLEY_HAS_CPP_ATTRIBUTE(clang::fallthrough)
-        #define JSON_HEDLEY_FALL_THROUGH [[clang::fallthrough]]
-    #elif (__cplusplus >= 201103L) && JSON_HEDLEY_GCC_VERSION_CHECK(7,0,0)
-        #define JSON_HEDLEY_FALL_THROUGH [[gnu::fallthrough]]
-    #endif
-#endif
-#if !defined(JSON_HEDLEY_FALL_THROUGH)
-    #if JSON_HEDLEY_GNUC_HAS_ATTRIBUTE(fallthrough,7,0,0) && !defined(JSON_HEDLEY_PGI_VERSION)
-        #define JSON_HEDLEY_FALL_THROUGH __attribute__((__fallthrough__))
-    #elif defined(__fallthrough) /* SAL */
-        #define JSON_HEDLEY_FALL_THROUGH __fallthrough
-    #else
-        #define JSON_HEDLEY_FALL_THROUGH
-    #endif
+#if JSON_HEDLEY_GNUC_HAS_ATTRIBUTE(fallthrough,7,0,0) && !defined(JSON_HEDLEY_PGI_VERSION)
+    #define JSON_HEDLEY_FALL_THROUGH __attribute__((__fallthrough__))
+#elif JSON_HEDLEY_HAS_CPP_ATTRIBUTE_NS(clang,fallthrough)
+    #define JSON_HEDLEY_FALL_THROUGH JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_([[clang::fallthrough]])
+#elif JSON_HEDLEY_HAS_CPP_ATTRIBUTE(fallthrough)
+    #define JSON_HEDLEY_FALL_THROUGH JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_([[fallthrough]])
+#elif defined(__fallthrough) /* SAL */
+    #define JSON_HEDLEY_FALL_THROUGH __fallthrough
+#else
+    #define JSON_HEDLEY_FALL_THROUGH
 #endif

 #if defined(JSON_HEDLEY_RETURNS_NON_NULL)
@ -1320,12 +1382,11 @@ JSON_HEDLEY_DIAGNOSTIC_POP
 #if defined(JSON_HEDLEY_REQUIRE_CONSTEXPR)
    #undef JSON_HEDLEY_REQUIRE_CONSTEXPR
 #endif
-/* Note the double-underscore. For internal use only; no API
- * guarantees! */
-#if defined(JSON_HEDLEY__IS_CONSTEXPR)
-    #undef JSON_HEDLEY__IS_CONSTEXPR
+/* JSON_HEDLEY_IS_CONSTEXPR_ is for
+   HEDLEY INTERNAL USE ONLY.  API subject to change without notice. */
+#if defined(JSON_HEDLEY_IS_CONSTEXPR_)
+    #undef JSON_HEDLEY_IS_CONSTEXPR_
 #endif
-
 #if \
    JSON_HEDLEY_HAS_BUILTIN(__builtin_constant_p) || \
    JSON_HEDLEY_GCC_VERSION_CHECK(3,4,0) || \
@ -1334,7 +1395,7 @@ JSON_HEDLEY_DIAGNOSTIC_POP
    JSON_HEDLEY_ARM_VERSION_CHECK(4,1,0) || \
    JSON_HEDLEY_IBM_VERSION_CHECK(13,1,0) || \
    JSON_HEDLEY_TI_VERSION_CHECK(6,1,0) || \
-    JSON_HEDLEY_SUNPRO_VERSION_CHECK(5,10,0) || \
+    (JSON_HEDLEY_SUNPRO_VERSION_CHECK(5,10,0) && !defined(__cplusplus)) || \
    JSON_HEDLEY_CRAY_VERSION_CHECK(8,1,0)
    #define JSON_HEDLEY_IS_CONSTANT(expr) __builtin_constant_p(expr)
 #endif
@ -1348,10 +1409,10 @@ JSON_HEDLEY_DIAGNOSTIC_POP
       JSON_HEDLEY_ARM_VERSION_CHECK(5,4,0) || \
       JSON_HEDLEY_TINYC_VERSION_CHECK(0,9,24)
 #if defined(__INTPTR_TYPE__)
-    #define JSON_HEDLEY__IS_CONSTEXPR(expr) __builtin_types_compatible_p(__typeof__((1 ? (void*) ((__INTPTR_TYPE__) ((expr) * 0)) : (int*) 0)), int*)
+    #define JSON_HEDLEY_IS_CONSTEXPR_(expr) __builtin_types_compatible_p(__typeof__((1 ? (void*) ((__INTPTR_TYPE__) ((expr) * 0)) : (int*) 0)), int*)
 #else
    #include <stdint.h>
-    #define JSON_HEDLEY__IS_CONSTEXPR(expr) __builtin_types_compatible_p(__typeof__((1 ? (void*) ((intptr_t) ((expr) * 0)) : (int*) 0)), int*)
+    #define JSON_HEDLEY_IS_CONSTEXPR_(expr) __builtin_types_compatible_p(__typeof__((1 ? (void*) ((intptr_t) ((expr) * 0)) : (int*) 0)), int*)
 #endif
 #  elif \
       (defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 201112L) && !defined(JSON_HEDLEY_SUNPRO_VERSION) && !defined(JSON_HEDLEY_PGI_VERSION)) || \
@ -1361,10 +1422,10 @@ JSON_HEDLEY_DIAGNOSTIC_POP
       JSON_HEDLEY_IBM_VERSION_CHECK(12,1,0) || \
       JSON_HEDLEY_ARM_VERSION_CHECK(5,3,0)
 #if defined(__INTPTR_TYPE__)
-    #define JSON_HEDLEY__IS_CONSTEXPR(expr) _Generic((1 ? (void*) ((__INTPTR_TYPE__) ((expr) * 0)) : (int*) 0), int*: 1, void*: 0)
+    #define JSON_HEDLEY_IS_CONSTEXPR_(expr) _Generic((1 ? (void*) ((__INTPTR_TYPE__) ((expr) * 0)) : (int*) 0), int*: 1, void*: 0)
 #else
    #include <stdint.h>
-    #define JSON_HEDLEY__IS_CONSTEXPR(expr) _Generic((1 ? (void*) ((intptr_t) * 0) : (int*) 0), int*: 1, void*: 0)
+    #define JSON_HEDLEY_IS_CONSTEXPR_(expr) _Generic((1 ? (void*) ((intptr_t) * 0) : (int*) 0), int*: 1, void*: 0)
 #endif
 #  elif \
       defined(JSON_HEDLEY_GCC_VERSION) || \
@ -1372,7 +1433,7 @@ JSON_HEDLEY_DIAGNOSTIC_POP
       defined(JSON_HEDLEY_TINYC_VERSION) || \
       defined(JSON_HEDLEY_TI_VERSION) || \
       defined(__clang__)
-#    define JSON_HEDLEY__IS_CONSTEXPR(expr) ( \
+#    define JSON_HEDLEY_IS_CONSTEXPR_(expr) ( \
        sizeof(void) != \
        sizeof(*( \
                  1 ? \
@ -1383,11 +1444,11 @@ JSON_HEDLEY_DIAGNOSTIC_POP
                                            )
 #  endif
 #endif
-#if defined(JSON_HEDLEY__IS_CONSTEXPR)
+#if defined(JSON_HEDLEY_IS_CONSTEXPR_)
    #if !defined(JSON_HEDLEY_IS_CONSTANT)
-        #define JSON_HEDLEY_IS_CONSTANT(expr) JSON_HEDLEY__IS_CONSTEXPR(expr)
+        #define JSON_HEDLEY_IS_CONSTANT(expr) JSON_HEDLEY_IS_CONSTEXPR_(expr)
    #endif
-    #define JSON_HEDLEY_REQUIRE_CONSTEXPR(expr) (JSON_HEDLEY__IS_CONSTEXPR(expr) ? (expr) : (-1))
+    #define JSON_HEDLEY_REQUIRE_CONSTEXPR(expr) (JSON_HEDLEY_IS_CONSTEXPR_(expr) ? (expr) : (-1))
 #else
    #if !defined(JSON_HEDLEY_IS_CONSTANT)
        #define JSON_HEDLEY_IS_CONSTANT(expr) (0)
@ -1427,12 +1488,10 @@ JSON_HEDLEY_DIAGNOSTIC_POP
    )
 #  define JSON_HEDLEY_STATIC_ASSERT(expr, message) _Static_assert(expr, message)
 #elif \
-  (defined(__cplusplus) && (__cplusplus >= 201703L)) || \
+  (defined(__cplusplus) && (__cplusplus >= 201103L)) || \
  JSON_HEDLEY_MSVC_VERSION_CHECK(16,0,0) || \
  (defined(__cplusplus) && JSON_HEDLEY_TI_VERSION_CHECK(8,3,0))
-#  define JSON_HEDLEY_STATIC_ASSERT(expr, message) static_assert(expr, message)
-#elif defined(__cplusplus) && (__cplusplus >= 201103L)
-#  define JSON_HEDLEY_STATIC_ASSERT(expr, message) static_assert(expr)
+#  define JSON_HEDLEY_STATIC_ASSERT(expr, message) JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_(static_assert(expr, message))
 #else
 #  define JSON_HEDLEY_STATIC_ASSERT(expr, message)
 #endif
@ -1483,6 +1542,23 @@ JSON_HEDLEY_DIAGNOSTIC_POP
    #define JSON_HEDLEY_CPP_CAST(T, expr) (expr)
 #endif

+#if defined(JSON_HEDLEY_NULL)
+    #undef JSON_HEDLEY_NULL
+#endif
+#if defined(__cplusplus)
+    #if __cplusplus >= 201103L
+        #define JSON_HEDLEY_NULL JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_(nullptr)
+    #elif defined(NULL)
+        #define JSON_HEDLEY_NULL NULL
+    #else
+        #define JSON_HEDLEY_NULL JSON_HEDLEY_STATIC_CAST(void*, 0)
+    #endif
+#elif defined(NULL)
+    #define JSON_HEDLEY_NULL NULL
+#else
+    #define JSON_HEDLEY_NULL ((void*) 0)
+#endif
+
 #if defined(JSON_HEDLEY_MESSAGE)
    #undef JSON_HEDLEY_MESSAGE
 #endif
@ -1525,28 +1601,33 @@ JSON_HEDLEY_DIAGNOSTIC_POP
 #  define JSON_HEDLEY_WARNING(msg) JSON_HEDLEY_MESSAGE(msg)
 #endif

+#if defined(JSON_HEDLEY_REQUIRE)
+    #undef JSON_HEDLEY_REQUIRE
+#endif
 #if defined(JSON_HEDLEY_REQUIRE_MSG)
    #undef JSON_HEDLEY_REQUIRE_MSG
 #endif
 #if JSON_HEDLEY_HAS_ATTRIBUTE(diagnose_if)
 #  if JSON_HEDLEY_HAS_WARNING("-Wgcc-compat")
-#    define JSON_HEDLEY_REQUIRE_MSG(expr, msg) \
+#    define JSON_HEDLEY_REQUIRE(expr) \
    JSON_HEDLEY_DIAGNOSTIC_PUSH \
    _Pragma("clang diagnostic ignored \"-Wgcc-compat\"") \
-    __attribute__((__diagnose_if__(!(expr), msg, "error"))) \
+    __attribute__((diagnose_if(!(expr), #expr, "error"))) \
+    JSON_HEDLEY_DIAGNOSTIC_POP
+#    define JSON_HEDLEY_REQUIRE_MSG(expr,msg) \
+    JSON_HEDLEY_DIAGNOSTIC_PUSH \
+    _Pragma("clang diagnostic ignored \"-Wgcc-compat\"") \
+    __attribute__((diagnose_if(!(expr), msg, "error"))) \
    JSON_HEDLEY_DIAGNOSTIC_POP
 #  else
-#    define JSON_HEDLEY_REQUIRE_MSG(expr, msg) __attribute__((__diagnose_if__(!(expr), msg, "error")))
+#    define JSON_HEDLEY_REQUIRE(expr) __attribute__((diagnose_if(!(expr), #expr, "error")))
+#    define JSON_HEDLEY_REQUIRE_MSG(expr,msg) __attribute__((diagnose_if(!(expr), msg, "error")))
 #  endif
 #else
-#  define JSON_HEDLEY_REQUIRE_MSG(expr, msg)
+#  define JSON_HEDLEY_REQUIRE(expr)
+#  define JSON_HEDLEY_REQUIRE_MSG(expr,msg)
 #endif

-#if defined(JSON_HEDLEY_REQUIRE)
-    #undef JSON_HEDLEY_REQUIRE
-#endif
-#define JSON_HEDLEY_REQUIRE(expr) JSON_HEDLEY_REQUIRE_MSG(expr, #expr)
-
 #if defined(JSON_HEDLEY_FLAGS)
    #undef JSON_HEDLEY_FLAGS
 #endif
@ -1568,6 +1649,15 @@ JSON_HEDLEY_DIAGNOSTIC_POP
 #  define JSON_HEDLEY_FLAGS_CAST(T, expr) JSON_HEDLEY_STATIC_CAST(T, expr)
 #endif

+#if defined(JSON_HEDLEY_EMPTY_BASES)
+    #undef JSON_HEDLEY_EMPTY_BASES
+#endif
+#if JSON_HEDLEY_MSVC_VERSION_CHECK(19,0,23918) && !JSON_HEDLEY_MSVC_VERSION_CHECK(20,0,0)
+    #define JSON_HEDLEY_EMPTY_BASES __declspec(empty_bases)
+#else
+    #define JSON_HEDLEY_EMPTY_BASES
+#endif
+
 /* Remaining macros are deprecated. */

 #if defined(JSON_HEDLEY_GCC_NOT_CLANG_VERSION_CHECK)
@ -1692,30 +1782,30 @@ JSON_HEDLEY_DIAGNOSTIC_POP
@def NLOHMANN_JSON_SERIALIZE_ENUM
@since version 3.4.0
 */
-#define NLOHMANN_JSON_SERIALIZE_ENUM(ENUM_TYPE, ...)                                           \
-    template<typename BasicJsonType>                                                           \
-    inline void to_json(BasicJsonType& j, const ENUM_TYPE& e)                                  \
-    {                                                                                          \
-        static_assert(std::is_enum<ENUM_TYPE>::value, #ENUM_TYPE " must be an enum!");         \
-        static const std::pair<ENUM_TYPE, BasicJsonType> m[] = __VA_ARGS__;                    \
-        auto it = std::find_if(std::begin(m), std::end(m),                                     \
-                               [e](const std::pair<ENUM_TYPE, BasicJsonType>& ej_pair) -> bool \
-        {                                                                                      \
-            return ej_pair.first == e;                                                         \
-        });                                                                                    \
-        j = ((it != std::end(m)) ? it : std::begin(m))->second;                                \
-    }                                                                                          \
-    template<typename BasicJsonType>                                                           \
-    inline void from_json(const BasicJsonType& j, ENUM_TYPE& e)                                \
-    {                                                                                          \
-        static_assert(std::is_enum<ENUM_TYPE>::value, #ENUM_TYPE " must be an enum!");         \
-        static const std::pair<ENUM_TYPE, BasicJsonType> m[] = __VA_ARGS__;                    \
-        auto it = std::find_if(std::begin(m), std::end(m),                                     \
-                               [j](const std::pair<ENUM_TYPE, BasicJsonType>& ej_pair) -> bool \
-        {                                                                                      \
-            return ej_pair.second == j;                                                        \
-        });                                                                                    \
-        e = ((it != std::end(m)) ? it : std::begin(m))->first;                                 \
+#define NLOHMANN_JSON_SERIALIZE_ENUM(ENUM_TYPE, ...)                                            \
+    template<typename BasicJsonType>                                                            \
+    inline void to_json(BasicJsonType& j, const ENUM_TYPE& e)                                   \
+    {                                                                                           \
+        static_assert(std::is_enum<ENUM_TYPE>::value, #ENUM_TYPE " must be an enum!");          \
+        static const std::pair<ENUM_TYPE, BasicJsonType> m[] = __VA_ARGS__;                     \
+        auto it = std::find_if(std::begin(m), std::end(m),                                      \
+                               [e](const std::pair<ENUM_TYPE, BasicJsonType>& ej_pair) -> bool  \
+        {                                                                                       \
+            return ej_pair.first == e;                                                          \
+        });                                                                                     \
+        j = ((it != std::end(m)) ? it : std::begin(m))->second;                                 \
+    }                                                                                           \
+    template<typename BasicJsonType>                                                            \
+    inline void from_json(const BasicJsonType& j, ENUM_TYPE& e)                                 \
+    {                                                                                           \
+        static_assert(std::is_enum<ENUM_TYPE>::value, #ENUM_TYPE " must be an enum!");          \
+        static const std::pair<ENUM_TYPE, BasicJsonType> m[] = __VA_ARGS__;                     \
+        auto it = std::find_if(std::begin(m), std::end(m),                                      \
+                               [&j](const std::pair<ENUM_TYPE, BasicJsonType>& ej_pair) -> bool \
+        {                                                                                       \
+            return ej_pair.second == j;                                                         \
+        });                                                                                     \
+        e = ((it != std::end(m)) ? it : std::begin(m))->first;                                  \
    }

 // Ugly macros to avoid uglier copy-paste when specializing basic_json. They
@ -2704,6 +2794,19 @@ struct is_compatible_type_impl <
 template <typename BasicJsonType, typename CompatibleType>
 struct is_compatible_type
    : is_compatible_type_impl<BasicJsonType, CompatibleType> {};
+
+// https://en.cppreference.com/w/cpp/types/conjunction
+template<class...> struct conjunction : std::true_type { };
+template<class B1> struct conjunction<B1> : B1 { };
+template<class B1, class... Bn>
+struct conjunction<B1, Bn...>
+: std::conditional<bool(B1::value), conjunction<Bn...>, B1>::type {};
+
+template <typename T1, typename T2>
+struct is_constructible_tuple : std::false_type {};
+
+template <typename T1, typename... Args>
+struct is_constructible_tuple<T1, std::tuple<Args...>> : conjunction<std::is_constructible<T1, Args>...> {};
 }  // namespace detail
 }  // namespace nlohmann

@ -2922,7 +3025,7 @@ void from_json(const BasicJsonType& j, std::valarray<T>& l)
        JSON_THROW(type_error::create(302, "type must be array, but is " + std::string(j.type_name())));
    }
    l.resize(j.size());
-    std::copy(j.m_value.array->begin(), j.m_value.array->end(), std::begin(l));
+    std::copy(j.begin(), j.end(), std::begin(l));
 }

 template <typename BasicJsonType, typename T, std::size_t N>
@ -3186,6 +3289,11 @@ namespace nlohmann
 {
 namespace detail
 {
+template<typename string_type>
+void int_to_string( string_type& target, std::size_t value )
+{
+    target = std::to_string(value);
+}
 template <typename IteratorType> class iteration_proxy_value
 {
  public:
@ -3194,6 +3302,7 @@ template <typename IteratorType> class iteration_proxy_value
    using pointer = value_type * ;
    using reference = value_type & ;
    using iterator_category = std::input_iterator_tag;
+    using string_type = typename std::remove_cv< typename std::remove_reference<decltype( std::declval<IteratorType>().key() ) >::type >::type;

  private:
    /// the iterator
@ -3203,9 +3312,9 @@ template <typename IteratorType> class iteration_proxy_value
    /// last stringified array index
    mutable std::size_t array_index_last = 0;
    /// a string representation of the array index
-    mutable std::string array_index_str = "0";
+    mutable string_type array_index_str = "0";
    /// an empty string (to return a reference for primitive values)
-    const std::string empty_str = "";
+    const string_type empty_str = "";

  public:
    explicit iteration_proxy_value(IteratorType it) noexcept : anchor(it) {}
@ -3238,7 +3347,7 @@ template <typename IteratorType> class iteration_proxy_value
    }

    /// return key of the iterator
-    const std::string& key() const
+    const string_type& key() const
    {
        assert(anchor.m_object != nullptr);

@ -3249,7 +3358,7 @@ template <typename IteratorType> class iteration_proxy_value
            {
                if (array_index != array_index_last)
                {
-                    array_index_str = std::to_string(array_index);
+                    int_to_string( array_index_str, array_index );
                    array_index_last = array_index;
                }
                return array_index_str;
@ -3489,7 +3598,10 @@ struct external_constructor<value_t::array>
        j.m_type = value_t::array;
        j.m_value = value_t::array;
        j.m_value.array->resize(arr.size());
-        std::copy(std::begin(arr), std::end(arr), j.m_value.array->begin());
+        if (arr.size() > 0)
+        {
+            std::copy(std::begin(arr), std::end(arr), j.m_value.array->begin());
+        }
        j.assert_invariant();
    }
 };
@ -3634,8 +3746,8 @@ void to_json(BasicJsonType& j, const T(&arr)[N])
    external_constructor<value_t::array>::construct(j, arr);
 }

-template<typename BasicJsonType, typename... Args>
-void to_json(BasicJsonType& j, const std::pair<Args...>& p)
+template < typename BasicJsonType, typename T1, typename T2, enable_if_t < std::is_constructible<BasicJsonType, T1>::value&& std::is_constructible<BasicJsonType, T2>::value, int > = 0 >
+void to_json(BasicJsonType& j, const std::pair<T1, T2>& p)
 {
    j = { p.first, p.second };
 }
@ -3654,10 +3766,10 @@ void to_json_tuple_impl(BasicJsonType& j, const Tuple& t, index_sequence<Idx...>
    j = { std::get<Idx>(t)... };
 }

-template<typename BasicJsonType, typename... Args>
-void to_json(BasicJsonType& j, const std::tuple<Args...>& t)
+template<typename BasicJsonType, typename T, enable_if_t<is_constructible_tuple<BasicJsonType, T>::value, int > = 0>
+void to_json(BasicJsonType& j, const T& t)
 {
-    to_json_tuple_impl(j, t, index_sequence_for<Args...> {});
+    to_json_tuple_impl(j, t, make_index_sequence<std::tuple_size<T>::value> {});
 }

 struct to_json_fn
@ -3882,9 +3994,8 @@ class input_stream_adapter : public input_adapter_protocol
 class input_buffer_adapter : public input_adapter_protocol
 {
  public:
-    JSON_HEDLEY_NON_NULL(2)
    input_buffer_adapter(const char* b, const std::size_t l) noexcept
-        : cursor(b), limit(b + l)
+        : cursor(b), limit(b == nullptr ? nullptr : (b + l))
    {}

    // delete because of pointer members
@ -3898,6 +4009,7 @@ class input_buffer_adapter : public input_adapter_protocol
    {
        if (JSON_HEDLEY_LIKELY(cursor < limit))
        {
+            assert(cursor != nullptr and limit != nullptr);
            return std::char_traits<char>::to_int_type(*(cursor++));
        }

@ -5675,7 +5787,7 @@ class binary_reader
                    const int exp = (half >> 10u) & 0x1Fu;
                    const unsigned int mant = half & 0x3FFu;
                    assert(0 <= exp and exp <= 32);
-                    assert(0 <= mant and mant <= 1024);
+                    assert(mant <= 1024);
                    switch (exp)
                    {
                        case 0:
@ -6957,7 +7069,7 @@ class binary_reader
    /*!
    @param[in] format   the current format
    @param[in] detail   a detailed error message
-    @param[in] context  further contect information
+    @param[in] context  further context information
    @return a message string to use in the parse_error exceptions
    */
    std::string exception_message(const input_format_t format,
@ -9315,8 +9427,8 @@ class iter_impl
    /*!
    @brief const copy constructor
    @param[in] other const iterator to copy from
-    @note This copy constuctor had to be defined explicitely to circumvent a bug
-          occuring on msvc v19.0 compiler (VS 2015) debug build. For more
+    @note This copy constructor had to be defined explicitly to circumvent a bug
+          occurring on msvc v19.0 compiler (VS 2015) debug build. For more
          information refer to: https://github.com/nlohmann/json/issues/1608
    */
    iter_impl(const iter_impl<const BasicJsonType>& other) noexcept
@ -10088,7 +10200,7 @@ class json_pointer
    /*!
    @brief append an array index at the end of this JSON pointer

-    @param[in] array_index  array index ot append
+    @param[in] array_index  array index to append
    @return JSON pointer with @a array_index appended

    @liveexample{The example shows the usage of `operator/=`.,json_pointer__operator_add}
@ -10229,7 +10341,7 @@ class json_pointer

    @since version 3.6.0
    */
-    const std::string& back()
+    const std::string& back() const
    {
        if (JSON_HEDLEY_UNLIKELY(empty()))
        {
@ -12041,13 +12153,12 @@ class binary_writer
    */
    static std::size_t calc_bson_array_size(const typename BasicJsonType::array_t& value)
    {
-        std::size_t embedded_document_size = 0ul;
        std::size_t array_index = 0ul;

-        for (const auto& el : value)
+        const std::size_t embedded_document_size = std::accumulate(std::begin(value), std::end(value), 0ul, [&array_index](std::size_t result, const typename BasicJsonType::array_t::value_type & el)
        {
-            embedded_document_size += calc_bson_element_size(std::to_string(array_index++), el);
-        }
+            return result + calc_bson_element_size(std::to_string(array_index++), el);
+        });

        return sizeof(std::int32_t) + embedded_document_size + 1ul;
    }
@ -12868,7 +12979,7 @@ inline cached_power get_cached_power_for_binary_exponent(int e)
    //      ==> 2^(q - 1 + alpha) <= c * 2^(e + q)
    //      ==> 2^(alpha - e - 1) <= c
    //
-    // If c were an exakt power of ten, i.e. c = 10^k, one may determine k as
+    // If c were an exact power of ten, i.e. c = 10^k, one may determine k as
    //
    //      k = ceil( log_10( 2^(alpha - e - 1) ) )
    //        = ceil( (alpha - e - 1) * log_10(2) )
@ -14264,7 +14375,7 @@ class serializer
        if (is_negative)
        {
            *buffer_ptr = '-';
-            abs_value = static_cast<number_unsigned_t>(std::abs(static_cast<std::intmax_t>(x)));
+            abs_value = remove_sign(x);

            // account one more byte for the minus sign
            n_chars = 1 + count_digits(abs_value);
@ -14445,6 +14556,32 @@ class serializer
        return state;
    }

+    /*
+     * Overload to make the compiler happy while it is instantiating
+     * dump_integer for number_unsigned_t.
+     * Must never be called.
+     */
+    number_unsigned_t remove_sign(number_unsigned_t x)
+    {
+        assert(false); // LCOV_EXCL_LINE
+        return x; // LCOV_EXCL_LINE
+    }
+
+    /*
+     * Helper function for dump_integer
+     *
+     * This function takes a negative signed integer and returns its absolute
+     * value as unsigned integer. The plus/minus shuffling is necessary as we can
+     * not directly remove the sign of an arbitrary signed integer as the
+     * absolute values of INT_MIN and INT_MAX are usually not the same. See
+     * #1708 for details.
+     */
+    inline number_unsigned_t remove_sign(number_integer_t x) noexcept
+    {
+        assert(x < 0 and x < (std::numeric_limits<number_integer_t>::max)());
+        return static_cast<number_unsigned_t>(-(x + 1)) + 1;
+    }
+
  private:
    /// the output of the serializer
    output_adapter_t<char> o = nullptr;
@ -15359,7 +15496,7 @@ class basic_json
                    object = nullptr;  // silence warning, see #821
                    if (JSON_HEDLEY_UNLIKELY(t == value_t::null))
                    {
-                        JSON_THROW(other_error::create(500, "961c151d2e87f2686a955a9be24d316f1362bf21 3.7.0")); // LCOV_EXCL_LINE
+                        JSON_THROW(other_error::create(500, "961c151d2e87f2686a955a9be24d316f1362bf21 3.7.1")); // LCOV_EXCL_LINE
                    }
                    break;
                }
@ -17039,11 +17176,11 @@ class basic_json
                                 detail::has_non_default_from_json<basic_json_t, ValueType>::value,
                                 int> = 0>
    ValueType get() const noexcept(noexcept(
-                                       JSONSerializer<ValueTypeCV>::from_json(std::declval<const basic_json_t&>())))
+                                       JSONSerializer<ValueType>::from_json(std::declval<const basic_json_t&>())))
    {
        static_assert(not std::is_reference<ValueTypeCV>::value,
                      "get() cannot be used with reference types, you might want to use get_ref()");
-        return JSONSerializer<ValueTypeCV>::from_json(*this);
+        return JSONSerializer<ValueType>::from_json(*this);
    }

    /*!
@ -18416,7 +18553,7 @@ class basic_json
    @since version 3.6.0
    */
    template<typename KeyT, typename std::enable_if<
-                 not std::is_same<KeyT, json_pointer>::value, int>::type = 0>
+                 not std::is_same<typename std::decay<KeyT>::type, json_pointer>::value, int>::type = 0>
    bool contains(KeyT && key) const
    {
        return is_object() and m_value.object->find(std::forward<KeyT>(key)) != m_value.object->end();
@ -18425,7 +18562,7 @@ class basic_json
    /*!
    @brief check the existence of an element in a JSON object given a JSON pointer

-    Check wehther the given JSON pointer @a ptr can be resolved in the current
+    Check whether the given JSON pointer @a ptr can be resolved in the current
    JSON value.

    @note This method can be executed on any JSON value type.
@ -22468,7 +22605,7 @@ struct hash<nlohmann::json>
 /// @note: do not remove the space after '<',
 ///        see https://github.com/nlohmann/json/pull/679
 template<>
-struct less< ::nlohmann::detail::value_t>
+struct less<::nlohmann::detail::value_t>
 {
    /*!
    @brief compare two value_t enum values
@ -22563,6 +22700,7 @@ inline nlohmann::json::json_pointer operator "" _json_pointer(const char* s, std
 #undef JSON_HEDLEY_ARRAY_PARAM
 #undef JSON_HEDLEY_ASSUME
 #undef JSON_HEDLEY_BEGIN_C_DECLS
+#undef JSON_HEDLEY_C_DECL
 #undef JSON_HEDLEY_CLANG_HAS_ATTRIBUTE
 #undef JSON_HEDLEY_CLANG_HAS_BUILTIN
 #undef JSON_HEDLEY_CLANG_HAS_CPP_ATTRIBUTE
@ -22575,21 +22713,23 @@ inline nlohmann::json::json_pointer operator "" _json_pointer(const char* s, std
 #undef JSON_HEDLEY_CONCAT
 #undef JSON_HEDLEY_CONCAT_EX
 #undef JSON_HEDLEY_CONST
-#undef JSON_HEDLEY_CONSTEXPR
 #undef JSON_HEDLEY_CONST_CAST
+#undef JSON_HEDLEY_CONSTEXPR
 #undef JSON_HEDLEY_CPP_CAST
 #undef JSON_HEDLEY_CRAY_VERSION
 #undef JSON_HEDLEY_CRAY_VERSION_CHECK
-#undef JSON_HEDLEY_C_DECL
 #undef JSON_HEDLEY_DEPRECATED
 #undef JSON_HEDLEY_DEPRECATED_FOR
 #undef JSON_HEDLEY_DIAGNOSTIC_DISABLE_CAST_QUAL
+#undef JSON_HEDLEY_DIAGNOSTIC_DISABLE_CPP98_COMPAT_WRAP_
 #undef JSON_HEDLEY_DIAGNOSTIC_DISABLE_DEPRECATED
+#undef JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_CPP_ATTRIBUTES
 #undef JSON_HEDLEY_DIAGNOSTIC_DISABLE_UNKNOWN_PRAGMAS
 #undef JSON_HEDLEY_DIAGNOSTIC_POP
 #undef JSON_HEDLEY_DIAGNOSTIC_PUSH
 #undef JSON_HEDLEY_DMC_VERSION
 #undef JSON_HEDLEY_DMC_VERSION_CHECK
+#undef JSON_HEDLEY_EMPTY_BASES
 #undef JSON_HEDLEY_EMSCRIPTEN_VERSION
 #undef JSON_HEDLEY_EMSCRIPTEN_VERSION_CHECK
 #undef JSON_HEDLEY_END_C_DECLS
@ -22618,6 +22758,7 @@ inline nlohmann::json::json_pointer operator "" _json_pointer(const char* s, std
 #undef JSON_HEDLEY_HAS_ATTRIBUTE
 #undef JSON_HEDLEY_HAS_BUILTIN
 #undef JSON_HEDLEY_HAS_CPP_ATTRIBUTE
+#undef JSON_HEDLEY_HAS_CPP_ATTRIBUTE_NS
 #undef JSON_HEDLEY_HAS_DECLSPEC_ATTRIBUTE
 #undef JSON_HEDLEY_HAS_EXTENSION
 #undef JSON_HEDLEY_HAS_FEATURE
@ -22631,15 +22772,18 @@ inline nlohmann::json::json_pointer operator "" _json_pointer(const char* s, std
 #undef JSON_HEDLEY_INTEL_VERSION
 #undef JSON_HEDLEY_INTEL_VERSION_CHECK
 #undef JSON_HEDLEY_IS_CONSTANT
+#undef JSON_HEDLEY_IS_CONSTEXPR_
 #undef JSON_HEDLEY_LIKELY
 #undef JSON_HEDLEY_MALLOC
 #undef JSON_HEDLEY_MESSAGE
 #undef JSON_HEDLEY_MSVC_VERSION
 #undef JSON_HEDLEY_MSVC_VERSION_CHECK
 #undef JSON_HEDLEY_NEVER_INLINE
+#undef JSON_HEDLEY_NO_ESCAPE
 #undef JSON_HEDLEY_NON_NULL
 #undef JSON_HEDLEY_NO_RETURN
 #undef JSON_HEDLEY_NO_THROW
+#undef JSON_HEDLEY_NULL
 #undef JSON_HEDLEY_PELLES_VERSION
 #undef JSON_HEDLEY_PELLES_VERSION_CHECK
 #undef JSON_HEDLEY_PGI_VERSION
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@ -6,7 +6,7 @@ option(JSON_Coverage "Build test suite with coverage information" OFF)
 if(JSON_Sanitizer)
    message(STATUS "Building test suite with Clang sanitizer")
    if(NOT MSVC)
-        set(CMAKE_CXX_FLAGS "-g -O2 -fsanitize=address -fsanitize=undefined -fsanitize=integer -fsanitize=nullability -fno-omit-frame-pointer")
+        set(CMAKE_CXX_FLAGS "-g -O0 -fsanitize=address -fsanitize=undefined -fsanitize=integer -fsanitize=nullability -fno-omit-frame-pointer -fno-sanitize-recover=all -fsanitize-recover=unsigned-integer-overflow")
    endif()
 endif()

@ -71,7 +71,7 @@ set_target_properties(doctest_main PROPERTIES
    COMPILE_DEFINITIONS "$<$<CXX_COMPILER_ID:MSVC>:_SCL_SECURE_NO_WARNINGS>"
    COMPILE_OPTIONS "$<$<CXX_COMPILER_ID:MSVC>:/EHsc;$<$<CONFIG:Release>:/Od>>"
 )
-if (${CMAKE_VERSION} VERSION_LESS "3.8.0") 
+if (${CMAKE_VERSION} VERSION_LESS "3.8.0")
    target_compile_features(doctest_main PUBLIC cxx_range_for)
 else()
    target_compile_features(doctest_main PUBLIC cxx_std_11)
@ -92,7 +92,7 @@ if(MSVC)
 	# Disable warning C4566: character represented by universal-character-name '\uFF01' cannot be represented in the current code page (1252)
 	# Disable warning C4996: 'nlohmann::basic_json<std::map,std::vector,std::string,bool,int64_t,uint64_t,double,std::allocator,nlohmann::adl_serializer>::operator <<': was declared deprecated
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} /wd4389 /wd4309 /wd4566 /wd4996")
-	
+
 	# https://github.com/nlohmann/json/issues/1114
 	set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /bigobj")
 endif()
@ -101,7 +101,49 @@ endif()
 # one executable for each unit test file
 #############################################################################

-file(GLOB files "src/unit-*.cpp")
+set(files
+    src/unit-algorithms.cpp
+    src/unit-allocator.cpp
+    src/unit-alt-string.cpp
+    src/unit-bson.cpp
+    src/unit-capacity.cpp
+    src/unit-cbor.cpp
+    src/unit-class_const_iterator.cpp
+    src/unit-class_iterator.cpp
+    src/unit-class_lexer.cpp
+    src/unit-class_parser.cpp
+    src/unit-comparison.cpp
+    src/unit-concepts.cpp
+    src/unit-constructor1.cpp
+    src/unit-constructor2.cpp
+    src/unit-convenience.cpp
+    src/unit-conversions.cpp
+    src/unit-deserialization.cpp
+    src/unit-element_access1.cpp
+    src/unit-element_access2.cpp
+    src/unit-inspection.cpp
+    src/unit-items.cpp
+    src/unit-iterators1.cpp
+    src/unit-iterators2.cpp
+    src/unit-json_patch.cpp
+    src/unit-json_pointer.cpp
+    src/unit-merge_patch.cpp
+    src/unit-meta.cpp
+    src/unit-modifiers.cpp
+    src/unit-msgpack.cpp
+    src/unit-noexcept.cpp
+    src/unit-pointer_access.cpp
+    src/unit-readme.cpp
+    src/unit-reference_access.cpp
+    src/unit-regression.cpp
+    src/unit-serialization.cpp
+    src/unit-testsuites.cpp
+    src/unit-to_chars.cpp
+    src/unit-ubjson.cpp
+    src/unit-udt.cpp
+    src/unit-unicode.cpp
+    src/unit-wstring.cpp)
+
 foreach(file ${files})
    get_filename_component(file_basename ${file} NAME_WE)
    string(REGEX REPLACE "unit-([^$]+)" "test-\\1" testcase ${file_basename})
--- a/test/cmake_import/CMakeLists.txt
+++ b/test/cmake_import/CMakeLists.txt
@ -1,6 +1,7 @@
 add_test(NAME cmake_import_configure
  COMMAND ${CMAKE_COMMAND}
    -G "${CMAKE_GENERATOR}"
+    -A "${CMAKE_GENERATOR_PLATFORM}"
    -Dnlohmann_json_DIR=${PROJECT_BINARY_DIR}
    ${CMAKE_CURRENT_SOURCE_DIR}/project
 )
--- a/test/cmake_import_minver/CMakeLists.txt
+++ b/test/cmake_import_minver/CMakeLists.txt
@ -1,6 +1,7 @@
 add_test(NAME cmake_import_minver_configure
  COMMAND ${CMAKE_COMMAND}
    -G "${CMAKE_GENERATOR}"
+    -A "${CMAKE_GENERATOR_PLATFORM}"
    -Dnlohmann_json_DIR=${PROJECT_BINARY_DIR}
    ${CMAKE_CURRENT_SOURCE_DIR}/project
 )
--- a/test/src/UBSAN.supp
+++ b/test/src/UBSAN.supp
@ -0,0 +1 @@
+unsigned-integer-overflow:stl_bvector.h
--- a/test/src/fuzzer-driver_afl.cpp
+++ b/test/src/fuzzer-driver_afl.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (fuzz test support)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 This file implements a driver for American Fuzzy Lop (afl-fuzz). It relies on
--- a/test/src/fuzzer-parse_bson.cpp
+++ b/test/src/fuzzer-parse_bson.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (fuzz test support)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 This file implements a parser test suitable for fuzz testing. Given a byte
--- a/test/src/fuzzer-parse_cbor.cpp
+++ b/test/src/fuzzer-parse_cbor.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (fuzz test support)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 This file implements a parser test suitable for fuzz testing. Given a byte
--- a/test/src/fuzzer-parse_json.cpp
+++ b/test/src/fuzzer-parse_json.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (fuzz test support)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 This file implements a parser test suitable for fuzz testing. Given a byte
--- a/test/src/fuzzer-parse_msgpack.cpp
+++ b/test/src/fuzzer-parse_msgpack.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (fuzz test support)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 This file implements a parser test suitable for fuzz testing. Given a byte
--- a/test/src/fuzzer-parse_ubjson.cpp
+++ b/test/src/fuzzer-parse_ubjson.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (fuzz test support)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 This file implements a parser test suitable for fuzz testing. Given a byte
--- a/test/src/unit-algorithms.cpp
+++ b/test/src/unit-algorithms.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit-allocator.cpp
+++ b/test/src/unit-allocator.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit-alt-string.cpp
+++ b/test/src/unit-alt-string.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
@ -38,6 +38,7 @@ SOFTWARE.
 /* forward declarations */
 class alt_string;
 bool operator<(const char* op1, const alt_string& op2);
+void int_to_string(alt_string& target, std::size_t value);

 /*
 * This is virtually a string class.
@ -154,6 +155,11 @@ class alt_string
    friend bool ::operator<(const char*, const alt_string&);
 };

+void int_to_string(alt_string& target, std::size_t value)
+{
+    target = std::to_string(value).c_str();
+}
+
 using alt_json = nlohmann::basic_json <
                 std::map,
                 std::vector,
@ -232,6 +238,35 @@ TEST_CASE("alternative string type")
        CHECK(dump == R"({"foo":"bar"})");
    }

+    SECTION("items")
+    {
+        auto doc = alt_json::parse("{\"foo\": \"bar\"}");
+
+        for ( auto item : doc.items() )
+        {
+            CHECK( item.key() == "foo" );
+            CHECK( item.value() == "bar" );
+        }
+
+        auto doc_array = alt_json::parse("[\"foo\", \"bar\"]");
+
+        for ( auto item : doc_array.items() )
+        {
+            if (item.key() == "0" )
+            {
+                CHECK( item.value() == "foo" );
+            }
+            else if (item.key() == "1" )
+            {
+                CHECK( item.value() == "bar" );
+            }
+            else
+            {
+                CHECK( false );
+            }
+        }
+    }
+
    SECTION("equality")
    {
        alt_json doc;
--- a/test/src/unit-bson.cpp
+++ b/test/src/unit-bson.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
@ -584,10 +584,9 @@ TEST_CASE("BSON input/output_adapters")
    {
        SECTION("std::ostringstream")
        {
-            std::ostringstream ss;
+            std::basic_ostringstream<std::uint8_t> ss;
            json::to_bson(json_representation, ss);
-            std::istringstream iss(ss.str());
-            json j3 = json::from_bson(iss);
+            json j3 = json::from_bson(ss.str());
            CHECK(json_representation == j3);
        }

--- a/test/src/unit-capacity.cpp
+++ b/test/src/unit-capacity.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit-cbor.cpp
+++ b/test/src/unit-cbor.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
@ -1287,7 +1287,7 @@ TEST_CASE("CBOR")
        }
    }

-    SECTION("additonal deserialization")
+    SECTION("additional deserialization")
    {
        SECTION("0x7b (string)")
        {
@ -1580,7 +1580,7 @@ TEST_CASE("single CBOR roundtrip")
        {
            SECTION("std::ostringstream")
            {
-                std::ostringstream ss;
+                std::basic_ostringstream<std::uint8_t> ss;
                json::to_cbor(j1, ss);
                json j3 = json::from_cbor(ss.str());
                CHECK(j1 == j3);
--- a/test/src/unit-class_const_iterator.cpp
+++ b/test/src/unit-class_const_iterator.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit-class_iterator.cpp
+++ b/test/src/unit-class_iterator.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit-class_lexer.cpp
+++ b/test/src/unit-class_lexer.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit-class_parser.cpp
+++ b/test/src/unit-class_parser.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
@ -210,7 +210,7 @@ json parser_helper(const std::string& s)
    json j;
    json::parser(nlohmann::detail::input_adapter(s)).parse(true, j);

-    // if this line was reached, no exception ocurred
+    // if this line was reached, no exception occurred
    // -> check if result is the same without exceptions
    json j_nothrow;
    CHECK_NOTHROW(json::parser(nlohmann::detail::input_adapter(s), nullptr, false).parse(true, j_nothrow));
--- a/test/src/unit-comparison.cpp
+++ b/test/src/unit-comparison.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit-concepts.cpp
+++ b/test/src/unit-concepts.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit-constructor1.cpp
+++ b/test/src/unit-constructor1.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit-constructor2.cpp
+++ b/test/src/unit-constructor2.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit-convenience.cpp
+++ b/test/src/unit-convenience.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit-conversions.cpp
+++ b/test/src/unit-conversions.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit-deserialization.cpp
+++ b/test/src/unit-deserialization.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit-element_access1.cpp
+++ b/test/src/unit-element_access1.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit-element_access2.cpp
+++ b/test/src/unit-element_access2.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit-inspection.cpp
+++ b/test/src/unit-inspection.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit-items.cpp
+++ b/test/src/unit-items.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit-iterators1.cpp
+++ b/test/src/unit-iterators1.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit-iterators2.cpp
+++ b/test/src/unit-iterators2.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit-json_patch.cpp
+++ b/test/src/unit-json_patch.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit-json_pointer.cpp
+++ b/test/src/unit-json_pointer.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
@ -559,6 +559,10 @@ TEST_CASE("JSON pointers")
        CHECK(!ptr.empty());
        CHECK(j[ptr] == j["answer"]["everything"]);

+        // check access via const pointer
+        const auto cptr = ptr;
+        CHECK(cptr.back() == "everything");
+
        ptr.pop_back();
        ptr.pop_back();
        CHECK(ptr.empty());
--- a/test/src/unit-merge_patch.cpp
+++ b/test/src/unit-merge_patch.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit-meta.cpp
+++ b/test/src/unit-meta.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
@ -43,10 +43,10 @@ TEST_CASE("version information")
        CHECK(j["url"] == "https://github.com/nlohmann/json");
        CHECK(j["version"] == json(
        {
-            {"string", "3.7.0"},
+            {"string", "3.7.1"},
            {"major", 3},
            {"minor", 7},
-            {"patch", 0}
+            {"patch", 1}
        }));

        CHECK(j.find("platform") != j.end());
--- a/test/src/unit-modifiers.cpp
+++ b/test/src/unit-modifiers.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit-msgpack.cpp
+++ b/test/src/unit-msgpack.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
@ -1334,7 +1334,7 @@ TEST_CASE("single MessagePack roundtrip")
        {
            SECTION("std::ostringstream")
            {
-                std::ostringstream ss;
+                std::basic_ostringstream<std::uint8_t> ss;
                json::to_msgpack(j1, ss);
                json j3 = json::from_msgpack(ss.str());
                CHECK(j1 == j3);
@ -1359,7 +1359,7 @@ TEST_CASE("MessagePack roundtrips" * doctest::skip())
 {
    SECTION("input from msgpack-python")
    {
-        // most of these are exluded due to differences in key order (not a real problem)
+        // most of these are excluded due to differences in key order (not a real problem)
        auto exclude_packed = std::set<std::string>
        {
            "test/data/json.org/1.json",
--- a/test/src/unit-noexcept.cpp
+++ b/test/src/unit-noexcept.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit-pointer_access.cpp
+++ b/test/src/unit-pointer_access.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit-readme.cpp
+++ b/test/src/unit-readme.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit-reference_access.cpp
+++ b/test/src/unit-reference_access.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit-regression.cpp
+++ b/test/src/unit-regression.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
@ -159,12 +159,55 @@ bool operator==(Data const& lhs, Data const& rhs)

 using float_json = nlohmann::basic_json<std::map, std::vector, std::string, bool, std::int64_t, std::uint64_t, float>;

+/////////////////////////////////////////////////////////////////////
+// for #1647
+/////////////////////////////////////////////////////////////////////
+namespace
+{
+struct NonDefaultFromJsonStruct { };
+
+inline bool operator== (NonDefaultFromJsonStruct const&, NonDefaultFromJsonStruct const&)
+{
+    return true;
+}
+
+enum class for_1647 { one, two };
+
+NLOHMANN_JSON_SERIALIZE_ENUM(for_1647,
+{
+    {for_1647::one, "one"},
+    {for_1647::two, "two"},
+})
+}
+
+namespace nlohmann
+{
+template <>
+struct adl_serializer<NonDefaultFromJsonStruct>
+{
+    static NonDefaultFromJsonStruct from_json (json const&) noexcept
+    {
+        return {};
+    }
+};
+}
+
+/////////////////////////////////////////////////////////////////////
+// for #1805
+/////////////////////////////////////////////////////////////////////
+
+struct NotSerializableData
+{
+    int mydata;
+    float myfloat;
+};
+

 TEST_CASE("regression tests")
 {
    SECTION("issue #60 - Double quotation mark is not parsed correctly")
    {
-        SECTION("escape_dobulequote")
+        SECTION("escape_doublequote")
        {
            auto s = "[\"\\\"foo\\\"\"]";
            json j = json::parse(s);
@ -1739,31 +1782,37 @@ TEST_CASE("regression tests")
    {
        SECTION("a bunch of -1, ensure_ascii=true")
        {
+            const auto length = 300;
+
            json dump_test;
-            std::vector<char> data(300, -1);
-            std::vector<std::string> vec_string(300, "\\ufffd");
-            std::string s{data.data(), data.size()};
-            dump_test["1"] = s;
-            std::ostringstream os;
-            os << "{\"1\":\"";
-            std::copy( vec_string.begin(), vec_string.end(), std::ostream_iterator<std::string>(os));
-            os << "\"}";
-            s = dump_test.dump(-1, ' ', true, nlohmann::json::error_handler_t::replace);
-            CHECK(s == os.str());
+            dump_test["1"] = std::string(length, -1);
+
+            std::string expected = "{\"1\":\"";
+            for (int i = 0; i < length; ++i)
+            {
+                expected += "\\ufffd";
+            }
+            expected += "\"}";
+
+            auto s = dump_test.dump(-1, ' ', true, nlohmann::json::error_handler_t::replace);
+            CHECK(s == expected);
        }
        SECTION("a bunch of -2, ensure_ascii=false")
        {
+            const auto length = 500;
+
            json dump_test;
-            std::vector<char> data(500, -2);
-            std::vector<std::string> vec_string(500, "\xEF\xBF\xBD");
-            std::string s{data.data(), data.size()};
-            dump_test["1"] = s;
-            std::ostringstream os;
-            os << "{\"1\":\"";
-            std::copy( vec_string.begin(), vec_string.end(), std::ostream_iterator<std::string>(os));
-            os << "\"}";
-            s = dump_test.dump(-1, ' ', false, nlohmann::json::error_handler_t::replace);
-            CHECK(s == os.str());
+            dump_test["1"] = std::string(length, -2);
+
+            std::string expected = "{\"1\":\"";
+            for (int i = 0; i < length; ++i)
+            {
+                expected += "\xEF\xBF\xBD";
+            }
+            expected += "\"}";
+
+            auto s = dump_test.dump(-1, ' ', false, nlohmann::json::error_handler_t::replace);
+            CHECK(s == expected);
        }
        SECTION("test case in issue #1445")
        {
@ -1802,6 +1851,51 @@ TEST_CASE("regression tests")
        json j = json::parse("[-9223372036854775808]");
        CHECK(j.dump() == "[-9223372036854775808]");
    }
+
+    SECTION("issue #1708 - minimum value of int64_t can be outputted")
+    {
+        constexpr auto smallest = (std::numeric_limits<int64_t>::min)();
+        json j = smallest;
+        CHECK(j.dump() == std::to_string(smallest));
+    }
+
+    SECTION("issue #1727 - Contains with non-const lvalue json_pointer picks the wrong overload")
+    {
+        json j = {{"root", {{"settings", {{"logging", true}}}}}};
+
+        auto jptr1 = "/root/settings/logging"_json_pointer;
+        auto jptr2 = json::json_pointer{"/root/settings/logging"};
+
+        CHECK(j.contains(jptr1));
+        CHECK(j.contains(jptr2));
+    }
+
+    SECTION("issue #1647 - compile error when deserializing enum if both non-default from_json and non-member operator== exists for other type")
+    {
+        {
+            json j;
+            NonDefaultFromJsonStruct x = j;
+            NonDefaultFromJsonStruct y;
+            CHECK(x == y);
+        }
+
+        auto val = nlohmann::json("one").get<for_1647>();
+        CHECK(val == for_1647::one);
+        json j = val;
+    }
+
+    SECTION("issue #1805 - A pair<T1, T2> is json constructible only if T1 and T2 are json constructible")
+    {
+        static_assert(!std::is_constructible<json, std::pair<std::string, NotSerializableData>>::value, "");
+        static_assert(!std::is_constructible<json, std::pair<NotSerializableData, std::string>>::value, "");
+        static_assert(std::is_constructible<json, std::pair<int, std::string>>::value, "");
+    }
+    SECTION("issue #1825 - A tuple<Args..> is json constructible only if all T in Args are json constructible")
+    {
+        static_assert(!std::is_constructible<json, std::tuple<std::string, NotSerializableData>>::value, "");
+        static_assert(!std::is_constructible<json, std::tuple<NotSerializableData, std::string>>::value, "");
+        static_assert(std::is_constructible<json, std::tuple<int, std::string>>::value, "");
+    }
 }

 #if not defined(JSON_NOEXCEPTION)
--- a/test/src/unit-serialization.cpp
+++ b/test/src/unit-serialization.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
@ -189,3 +189,20 @@ TEST_CASE("serialization")
        test("[3,\"false\",false]", "[3,\\\"false\\\",false]");
    }
 }
+
+TEST_CASE_TEMPLATE("serialization for extreme integer values", T, int32_t, uint32_t, int64_t, uint64_t)
+{
+    SECTION("minimum")
+    {
+        constexpr auto minimum = (std::numeric_limits<T>::min)();
+        json j = minimum;
+        CHECK(j.dump() == std::to_string(minimum));
+    }
+
+    SECTION("maximum")
+    {
+        constexpr auto maximum = (std::numeric_limits<T>::max)();
+        json j = maximum;
+        CHECK(j.dump() == std::to_string(maximum));
+    }
+}
--- a/test/src/unit-testsuites.cpp
+++ b/test/src/unit-testsuites.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit-to_chars.cpp
+++ b/test/src/unit-to_chars.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit-ubjson.cpp
+++ b/test/src/unit-ubjson.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit-udt.cpp
+++ b/test/src/unit-udt.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
@ -238,7 +238,7 @@ void from_json(const nlohmann::json& j, contact_book& cb)
 TEST_CASE("basic usage" * doctest::test_suite("udt"))
 {

-    // a bit narcissic maybe :) ?
+    // a bit narcissistic maybe :) ?
    const udt::age a
    {
        23
--- a/test/src/unit-unicode.cpp
+++ b/test/src/unit-unicode.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
@ -1152,7 +1152,7 @@ TEST_CASE("Unicode" * doctest::skip())
        json j;
        CHECK_NOTHROW(f >> j);

-        // the array has 1112064 + 1 elemnts (a terminating "null" value)
+        // the array has 1112064 + 1 elements (a terminating "null" value)
        // Note: 1112064 = 0x1FFFFF code points - 2048 invalid values between
        // 0xD800 and 0xDFFF.
        CHECK(j.size() == 1112065);
--- a/test/src/unit-wstring.cpp
+++ b/test/src/unit-wstring.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/src/unit.cpp
+++ b/test/src/unit.cpp
@ -1,7 +1,7 @@
 /*
    __ _____ _____ _____
 __|  |   __|     |   | |  JSON for Modern C++ (test suite)
-|  |  |__   |  |  | | | |  version 3.7.0
+|  |  |__   |  |  | | | |  version 3.7.1
 |_____|_____|_____|_|___|  https://github.com/nlohmann/json

 Licensed under the MIT License <http://opensource.org/licenses/MIT>.
--- a/test/thirdparty/doctest/doctest.h
+++ b/test/thirdparty/doctest/doctest.h