- Update to 4.9.0:
  * This feature release adds `typing_extensions.ReadOnly`, as
    specified by PEP 705, and makes various other improvements,
    especially to `@typing_extensions.deprecated()`.
  * Add support for PEP 705, adding `typing_extensions.ReadOnly`.
  * All parameters on `NewType.__call__` are now positional-only.
    This means that the signature of
    `typing_extensions.NewType.__call__` now exactly matches the
  * signature of `typing.NewType.__call__`.
  * Fix bug with using `@deprecated` on a mixin class.
  * Exclude `__match_args__` from `Protocol` members.
  * When creating a `typing_extensions.NamedTuple` class, ensure
    `__set_name__` is called on all objects that define
    `__set_name__` and exist in the values of the `NamedTuple`
    class's class dictionary.
- Update to 4.8.0:
  * Add typing_extensions.Doc, as proposed by PEP 727
  * Drop support for Python 3.7 (including PyPy-3.7)
  * Fix bug where get_original_bases() would return incorrect
    results when called on a concrete subclass of a generic class
  * Fix bug where ParamSpec(default=...) would raise a TypeError
    on Python versions <3.11
- Update to 4.7.1:
  * Fix support for `TypedDict`, `NamedTuple` and `is_protocol`
    on PyPy-3.7 and PyPy-3.8. Patch by Alex Waygood.
    Note that PyPy-3.7 and PyPy-3.8 are unsupported by the PyPy
    project.
    The next feature release of typing-extensions will drop
    support for PyPy-3.7 and may also drop support for PyPy-3.8.
- Update to 4.7.0:

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