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Changes
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* 3849: Overhaul warning system for better visibility.
Documentation changes
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* 3859: Added a note about historical presence of ``wheel``
in ``build-system.requires``, in ``pyproject.toml``.
* 3893: Improved the documentation example regarding making a thin :pep:`517` in-tree
backend wrapper of ``setuptools.build_meta`` that is future-proof and supports
:pep:`660` hook too -- by :user:`webknjaz`.
Misc
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* 3884: Add a ``stacklevel`` parameter to ``warnings.warn()`` to provide more information to the user.
-- by :user:`cclauss`