4.14.0rc1

Major changes:

• Drop support for Python 3.8 (including PyPy-3.8). Patch by Victorien Plot.
• Do not attempt to re-export names that have been removed from typing,
  anticipating the removal of typing.no_type_check_decorator in Python 3.15.
  Patch by Jelle Zijlstra.
• Update typing_extensions.Format, typing_extensions.evaluate_forward_ref, and
  typing_extensions.TypedDict to align
  with changes in Python 3.14. Patches by Jelle Zijlstra.
• Fix tests for Python 3.14 and 3.15. Patches by Jelle Zijlstra.

New features:

• Add support for inline typed dictionaries (PEP 764).
  Patch by Victorien Plot.
• Add typing_extensions.Reader and typing_extensions.Writer. Patch by
  Sebastian Rittau.
• Add support for sentinels (PEP 661). Patch by
  Victorien Plot.