- 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:
  * This is expected to be the last feature release supporting
    Python 3.7, which reaches its end of life on June 27, 2023.
    Version 4.8.0 will support only Python 3.8.0 and up.
  * Fix bug where a `typing_extensions.Protocol` class that had
    one or more non-callable members would raise `TypeError` when
    `issubclass()` was called against it, even if it defined a
    custom `__subclasshook__` method. The correct behaviour,
    which has now been restored, is not to raise `TypeError` in
    these situations if a custom `__subclasshook__` method
    is defined. Patch by Alex Waygood (backporting
    https://github.com/python/cpython/pull/105976).
- Update to 4.7.0rc1:
  * Add `typing_extensions.get_protocol_members` and
    `typing_extensions.is_protocol` (backport of CPython PR #104878).
    Patch by Jelle Zijlstra.
  * `typing_extensions` now re-exports all names in the standard
    library's `typing` module, except the deprecated `ByteString`.
    Patch by Jelle Zijlstra.
  * Due to changes in the implementation of
    `typing_extensions.Protocol`, `typing.runtime_checkable` can
    now be used on `typing_extensions.Protocol` (previously, users
    had to use `typing_extensions.runtime_checkable` if they were
    using `typing_extensions.Protocol`).
  * Align the implementation of `TypedDict` with the implementation in
    the standard library on Python 3.9 and higher.
    `typing_extensions.TypedDict` is now a function instead of a class.
    The private functions `_check_fails`, `_dict_new`, and `_typeddict_new`
    have been removed. `is_typeddict` now returns `False` when called
    with `TypedDict` itself as the argument. Patch by Jelle Zijlstra.
  * Declare support for Python 3.12. Patch by Jelle Zijlstra.
  * Fix tests on Python 3.13, which removes support for creating
    `TypedDict` classes through the keyword-argument syntax.
    Patch by Jelle Zijlstra.
  * Fix a regression introduced in v4.6.3 that meant that
    `issubclass(object, typing_extensions.Protocol)` would
    erroneously raise `TypeError`.
    Patch by Alex Waygood (backporting the CPython PR
    https://github.com/python/cpython/pull/105239).
  * Allow `Protocol` classes to inherit from `typing_extensions.Buffer`
    or `collections.abc.Buffer`. Patch by Alex Waygood (backporting
    https://github.com/python/cpython/pull/104827, by Jelle Zijlstra).
  * Allow classes to inherit from both `typing.Protocol` and
    `typing_extensions.Protocol` simultaneously. Since v4.6.0, this
    caused `TypeError` to be raised due to a metaclass conflict.
    Patch by Alex Waygood.
  * Backport several deprecations from CPython relating to unusual
    ways to create `TypedDict`s and `NamedTuple`s.
    CPython PRs #105609 and #105780 by Alex Waygood;
    `typing_extensions` backport by Jelle Zijlstra.
    Creating a `NamedTuple` using the functional syntax with keyword
    arguments (`NT = NamedTuple("NT", a=int)`) is now deprecated.
    Creating a `NamedTuple` with zero fields using the syntax
    `NT = NamedTuple("NT")` or `NT = NamedTuple("NT", None)`
    is now deprecated.
    Creating a `TypedDict` with zero fields using the syntax
    `TD = TypedDict("TD")` or `TD = TypedDict("TD", None)`
    is now deprecated.
  * Fix bug on Python 3.7 where a protocol `X` that had a member `a`
    would not be considered an implicit subclass of an unrelated
    protocol `Y` that only has a member `a`. Where the members of `X`
    are a superset of the members of `Y`, `X` should always be
    considered a subclass of `Y` iff `Y` is a runtime-checkable
    protocol that only has callable members.
    Patch by Alex Waygood (backporting CPython PR
    https://github.com/python/cpython/pull/105835).
- Update to 4.6.3:
  * Fix a regression introduced in v4.6.0 in the implementation of
    runtime-checkable protocols. The regression meant
    that doing `class Foo(X, typing_extensions.Protocol)`, where `X`
    was a class that had `abc.ABCMeta` as its metaclass, would then
    cause subsequent `isinstance(1, X)` calls to erroneously raise
    `TypeError`.
    Patch by Alex Waygood (backporting the CPython PR
    https://github.com/python/cpython/pull/105152).
  * Sync the repository's LICENSE file with that of CPython.
    `typing_extensions` is distributed under the same license as
    CPython itself.
  * Skip a problematic test on Python 3.12.0b1. The test fails on
    3.12.0b1 due to a bug in CPython, which will be fixed in 3.12.0b2.
    The `typing_extensions` test suite now passes on 3.12.0b1.
- Update to 4.6.2:
  * Fix use of `@deprecated` on classes with `__new__` but no
    `__init__`.
    Patch by Jelle Zijlstra.
  * Fix regression in version 4.6.1 where comparing a generic class
    against a runtime-checkable protocol using `isinstance()` would
    cause `AttributeError` to be raised if using Python 3.7.
- Update to 4.6.1:
  * Change deprecated `@runtime` to formal API `@runtime_checkable`
    in the error message. Patch by Xuehai Pan.
  * Fix regression in 4.6.0 where attempting to define a `Protocol`
    that was generic over a `ParamSpec` or a `TypeVarTuple` would
    cause `TypeError` to be raised. Patch by Alex Waygood.
- Update to 4.6.0:
  * `typing_extensions` is now documented at
    https://typing-extensions.readthedocs.io/en/latest/.
    Patch by Jelle Zijlstra.
  * Add `typing_extensions.Buffer`, a marker class for buffer types,
    as proposed by PEP 688. Equivalent to `collections.abc.Buffer`
    in Python 3.12. Patch by Jelle Zijlstra.
  * Backport two CPython PRs fixing various issues with
    `typing.Literal`:
    https://github.com/python/cpython/pull/23294 and
    https://github.com/python/cpython/pull/23383.
    Both CPython PRs were originally by Yurii Karabas, and both were
    backported to Python >=3.9.1, but no earlier.
    Patch by Alex Waygood.
    A side effect of one of the changes is that equality comparisons
    of `Literal` objects will now raise a `TypeError` if one of the
    `Literal` objects being compared has a mutable parameter.
    (Using mutable parameters with `Literal` is not supported
    by PEP 586 or by any major static type checkers.)
  * `Literal` is now reimplemented on all Python versions <= 3.10.0.
    The `typing_extensions` version does not suffer from the bug that
    was fixed in https://github.com/python/cpython/pull/29334.
    (The CPython bugfix was backported to CPython 3.10.1 and 3.9.8,
    but no earlier.)
  * Backport [CPython PR 26067]
    (https://github.com/python/cpython/pull/26067)
    (originally by Yurii Karabas), ensuring that `isinstance()`
    calls on protocols raise `TypeError` when the protocol is not
    decorated with `@runtime_checkable`. Patch by Alex Waygood.
  * Backport several significant performance improvements to
    runtime-checkable protocols that have been made in Python 3.12
    (see https://github.com/python/cpython/issues/74690 for details).
    Patch by Alex Waygood.
    A side effect of one of the performance improvements is that the
    members of a runtime-checkable protocol are now considered
    “frozen” at runtime as soon as the class has been created.
    Monkey-patching attributes onto a runtime-checkable protocol will
    still work, but will have no impact on `isinstance()` checks
    comparing objects to the protocol. See ["What's New in Python 3.12"]
    (https://docs.python.org/3.12/whatsnew/3.12.html#typing)
    for more details.
  * `isinstance()` checks against runtime-checkable protocols now
    use `inspect.getattr_static()` rather than `hasattr()` to lookup
    whether attributes exist
    (backporting https://github.com/python/cpython/pull/103034).
    This means that descriptors and `__getattr__` methods are no
    longer unexpectedly evaluated during `isinstance()` checks against
    runtime-checkable protocols. However, it may also mean that some
    objects which used to be considered instances of a runtime-checkable
    protocol on older versions of `typing_extensions` may no longer
    be considered instances of that protocol using the new release,
    and vice versa. Most users are unlikely to be affected by this change.
    Patch by Alex Waygood.
  * Backport the ability to define `__init__` methods on Protocol
    classes, a change made in Python 3.11 (originally implemented in
    https://github.com/python/cpython/pull/31628 by Adrian Garcia Badaracco).
    Patch by Alex Waygood.
  * Speedup `isinstance(3, typing_extensions.SupportsIndex)`
    by >10x on Python <3.12. Patch by Alex Waygood.
  * Add `typing_extensions` versions of `SupportsInt`, `SupportsFloat`,
    `SupportsComplex`, `SupportsBytes`, `SupportsAbs` and `SupportsRound`.
    These have the same semantics as the versions from the `typing`
    module, but `isinstance()` checks against the `typing_extensions`
    versions are >10x faster at runtime on Python <3.12.
    Patch by Alex Waygood.
  * Add `__orig_bases__` to non-generic TypedDicts, call-based TypedDicts,
    and call-based NamedTuples. Other TypedDicts and NamedTuples already
    had the attribute. Patch by Adrian Garcia Badaracco.
  * Add `typing_extensions.get_original_bases`, a backport of
    [`types.get_original_bases`]
    (https://docs.python.org/3.12/library/types.html#types.get_original_bases),
    introduced in Python 3.12 (CPython PR
    https://github.com/python/cpython/pull/101827,
    originally by James Hilton-Balfe). Patch by Alex Waygood.
    This function should always produce correct results when called
    on classes constructed using features from `typing_extensions`.
    However, it may produce incorrect results when called on some
    `NamedTuple` or `TypedDict` classes that use
    `typing.{NamedTuple,TypedDict}` on Python <=3.11.
  * Constructing a call-based `TypedDict` using keyword arguments
    for the fields now causes a `DeprecationWarning` to be emitted.
    This matches the behaviour of `typing.TypedDict` on 3.11 and 3.12.
  * Backport the implementation of `NewType` from 3.10
    (where it is implemented as a class rather than a function).
    This allows user-defined `NewType`s to be pickled.
    Patch by Alex Waygood.
  * Fix tests and import on Python 3.12, where `typing.TypeVar`
    can no longer be subclassed. Patch by Jelle Zijlstra.
  * Add `typing_extensions.TypeAliasType`, a backport of
    `typing.TypeAliasType` from PEP 695. Patch by Jelle Zijlstra.
  * Backport changes to the repr of `typing.Unpack` that were made
    in order to implement [PEP 692](https://peps.python.org/pep-0692/)
    (backport of https://github.com/python/cpython/pull/104048).
    Patch by Alex Waygood.

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