Setuptools

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Changes
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* 2722: Added support for ``SETUPTOOLS_EXT_SUFFIX`` environment variable to override the suffix normally detected from the ``sysconfig`` module.

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Changes
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* 2465: Documentation is now published using the Furo theme.

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Changes
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* 2724: Added detection of Windows ARM64 build environments using the ``VSCMD_ARG_TGT_ARCH`` environment variable.

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Changes
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* 2692: Globs are now sorted in 'license_files' restoring reproducibility by eliminating variance from disk order.
* 2714: Update to distutils at pypa/distutilse2627b7.
* 2715: Removed reliance on deprecated ssl.match_hostname by removing the ssl support. Now any index operations rely on the native SSL implementation.

Documentation changes
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* 2604: Revamped the backward/cross tool compatibility section to remove
some confusion.
Add some examples and the version since when ``entry_points`` are
supported in declarative configuration.
Tried to make the reading flow a bit leaner, gather some information
that were a bit dispersed.

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Breaking Changes
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* 2645: License files excluded via the ``MANIFEST.in`` but matched by either
the ``license_file`` (deprecated) or ``license_files`` options,
will be nevertheless included in the source distribution. - by :user:`cdce8p`

Changes
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* 2628: Write long description in message payload of PKG-INFO file. - by :user:`cdce8p`
* 2645: Added ``License-File`` (multiple) to the output package metadata.
The field will contain the path of a license file, matched by the
``license_file`` (deprecated) and ``license_files`` options,
relative to ``.dist-info``. - by :user:`cdce8p`
* 2678: Moved Setuptools' own entry points into declarative config.
* 2680: Vendored :pypi:`more_itertools` for Setuptools.
* 2681: Setuptools own setup.py no longer declares setup_requires, but instead expects wheel to be installed as declared by pyproject.toml.

Misc
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* 2650: Updated the docs build tooling to support the latest version of
Towncrier and show the previews of not-yet-released setuptools versions
in the changelog -- :user:`webknjaz`

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Changes
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* 2640: Fixed handling of multiline license strings. - by :user:`cdce8p`
* 2641: Setuptools will now always try to use the latest supported
metadata version for ``PKG-INFO``. - by :user:`cdce8p`