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docs: update changelog (#3099)

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* docs: update changelog

* docs: add one more and merge tidy
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@ -9,12 +9,143 @@ Starting with version 1.8.0, pybind11 releases use a `semantic versioning
v2.7.0 (TBA, not yet released)
------------------------------
New features:
* Enable ``py::implicitly_convertible<py::none, ...>`` for
``py::class_``-wrapped types.
`#3059 <https://github.com/pybind/pybind11/pull/3059>`_
* Allow function pointer extraction from overloaded functions.
`#2944 <https://github.com/pybind/pybind11/pull/2944>`_
* NumPy: added ``.char_()`` to type which gives the NumPy public ``char``
result, which also distinguishes types by bit length (unlike ``.kind()``).
`#2864 <https://github.com/pybind/pybind11/pull/2864>`_
* Add ``pybind11::bytearray`` to manipulate ``bytearray`` similar to ``bytes``.
`#2799 <https://github.com/pybind/pybind11/pull/2799>`_
* ``pybind11/stl/filesystem.h`` registers a type caster that, on C++17/Python
3.6+, converts ``std::filesystem::path`` to ``pathlib.Path`` and any
``os.PathLike`` to ``std::filesystem::path``.
`#2730 <https://github.com/pybind/pybind11/pull/2730>`_
Changes:
* ``py::str`` changed to exclusively hold `PyUnicodeObject`. Previously
``py::str`` could also hold `bytes`, which is probably surprising, was
never documented, and can mask bugs (e.g. accidental use of ``py::str``
instead of ``py::bytes``).
`#2409 <https://github.com/pybind/pybind11/pull/2409>`_
* Add a safety guard to ensure that the Python GIL is held when C++ calls back
into Python via ``object_api<>::operator()`` (e.g. ``py::function``
``__call__``). (This feature is available for Python 3.6+ only.)
`#2919 <https://github.com/pybind/pybind11/pull/2919>`_
* Catch a missing ``self`` argument in calls to ``__init__()``.
`#2914 <https://github.com/pybind/pybind11/pull/2914>`_
* Use ``std::string_view`` if available to avoid a copy when passing an object
to a ``std::ostream``.
`#3042 <https://github.com/pybind/pybind11/pull/3042>`_
* An important warning about thread safety was added to the ``iostream.h``
documentation; attempts to make ``py::scoped_ostream_redirect`` thread safe
have been removed, as it was only partially effective.
`#2995 <https://github.com/pybind/pybind11/pull/2995>`_
Fixes:
* Performance: avoid unnecessary strlen calls.
`#3058 <https://github.com/pybind/pybind11/pull/3058>`_
* Fix auto-generated documentation string when using ``const T`` in
``pyarray_t``.
`#3020 <https://github.com/pybind/pybind11/pull/3020>`_
* Unify error messages thrown by ``simple_collector``/``unpacking_collector``.
`#3013 <https://github.com/pybind/pybind11/pull/3013>`_
* ``pybind11::builtin_exception`` is now explicitly exported, which means the
types included/defined in different modules are identical, and exceptions
raised in different modules can be caught correctly. The documentation was
updated to explain that custom exceptions that are used across module
boundaries need to be explicitly exported as well.
`#2999 <https://github.com/pybind/pybind11/pull/2999>`_
* Fixed exception when printing UTF-8 to a ``scoped_ostream_redirect``.
`#2982 <https://github.com/pybind/pybind11/pull/2982>`_
* Pickle support enhancement: ``setstate`` implementation will attempt to
``setattr`` ``__dict__`` only if the unpickled ``dict`` object is not empty,
to not force use of ``py::dynamic_attr()`` unnecessarily.
`#2972 <https://github.com/pybind/pybind11/pull/2972>`_
* Allow negative timedelta values to roundtrip.
`#2870 <https://github.com/pybind/pybind11/pull/2870>`_
* Fix unchecked errors could potentially swallow signals/other exceptions.
`#2863 <https://github.com/pybind/pybind11/pull/2863>`_
* Add null pointer check with ``std::localtime``.
`#2846 <https://github.com/pybind/pybind11/pull/2846>`_
* Fix the ``weakref`` constructor from ``py::object`` to create a new
``weakref`` on conversion.
`#2832 <https://github.com/pybind/pybind11/pull/2832>`_
* Avoid relying on exceptions in C++17 when getting a ``shared_ptr`` holder
from a ``shared_from_this`` class.
`#2819 <https://github.com/pybind/pybind11/pull/2819>`_
Build system improvements:
* In ``setup_helpers.py``, test for platforms that have some multiprocessing
features but lack semaphores, which ``ParallelCompile`` requires.
`#3043 <https://github.com/pybind/pybind11/pull/3043>`_
* Fix ``pybind11_INCLUDE_DIR`` in case ``CMAKE_INSTALL_INCLUDEDIR`` is
absolute.
`#3005 <https://github.com/pybind/pybind11/pull/3005>`_
* Fix bug not respecting ``WITH_SOABI`` or ``WITHOUT_SOABI`` to CMake.
`#2938 <https://github.com/pybind/pybind11/pull/2938>`_
* Fix the default ``Pybind11Extension`` compilation flags with a Mingw64 python.
`#2921 <https://github.com/pybind/pybind11/pull/2921>`_
* Clang on Windows: do not pass ``/MP`` (ignored flag).
`#2824 <https://github.com/pybind/pybind11/pull/2824>`_
Backend and tidying up:
* Enable clang-tidy performance, readability, and modernization checks
throughout the codebase to enforce best coding practices.
`#3046 <https://github.com/pybind/pybind11/pull/3046>`_,
`#3049 <https://github.com/pybind/pybind11/pull/3049>`_,
`#3051 <https://github.com/pybind/pybind11/pull/3051>`_,
`#3052 <https://github.com/pybind/pybind11/pull/3052>`_, and
`#3080 <https://github.com/pybind/pybind11/pull/3080>`_
* Checks for common misspellings were added to the pre-commit hooks.
`#3076 <https://github.com/pybind/pybind11/pull/3076>`_
* Changed ``Werror`` to stricter ``Werror-all`` for Intel compiler and fixed
minor issues.
`#2948 <https://github.com/pybind/pybind11/pull/2948>`_
* Fixed compilation with GCC < 5 when the user defines ``_GLIBCXX_USE_CXX11_ABI``.
`#2956 <https://github.com/pybind/pybind11/pull/2956>`_
* Added nox support for easier local testing and linting of contributions.
`#3101 <https://github.com/pybind/pybind11/pull/3101>`_
v2.6.2 (Jan 26, 2021)
---------------------