• Add typing_extensions.Doc, as proposed by PEP 727. Patch by
  Sebastián Ramírez.
• Drop support for Python 3.7 (including PyPy-3.7). Patch by Alex Waygood.
• Fix bug where get_original_bases() would return incorrect results when
  called on a concrete subclass of a generic class. Patch by Alex Waygood
  (backporting python/cpython#107584, by James
  Hilton-Balfe).
• Fix bug where ParamSpec(default=...) would raise a TypeError on Python
  versions <3.11. Patch by James Hilton-Balfe