Anyio

- Added **experimental** support for running functions in subinterpreters on Python
3.13 and later
- Added support for the ``copy()``, ``copy_into()``, ``move()`` and ``move_into()``
methods in ``anyio.Path``, available in Python 3.14
- Changed ``TaskGroup`` on asyncio to always spawn tasks non-eagerly, even if using a
task factory created via ``asyncio.create_eager_task_factory()``, to preserve expected
Trio-like task scheduling semantics (PR by agronholm and graingert)
- Configure ``SO_RCVBUF``, ``SO_SNDBUF`` and ``TCP_NODELAY`` on the selector
thread waker socket pair (this should improve the performance of ``wait_readable()``)
and ``wait_writable()`` when using the ``ProactorEventLoop``
(`836 <https://github.com/agronholm/anyio/pull/836>`_; PR by graingert)
- Fixed ``AssertionError`` when using ``nest-asyncio``
(`840 <https://github.com/agronholm/anyio/issues/840>`_)
- Fixed return type annotation of various context managers' ``__exit__`` method
(`847 <https://github.com/agronholm/anyio/issues/847>`_; PR by Enegg)

- Updated ``TaskGroup`` to work with asyncio's eager task factories
(`764 <https://github.com/agronholm/anyio/issues/764>`_)
- Added the ``wait_readable()`` and ``wait_writable()`` functions which will accept
an object with a ``.fileno()`` method or an integer handle, and deprecated
their now obsolete versions (``wait_socket_readable()`` and
``wait_socket_writable()``) (PR by davidbrochart)
- Changed ``EventAdapter`` (an ``Event`` with no bound async backend) to allow ``set()``
to work even before an async backend is bound to it
(`819 <https://github.com/agronholm/anyio/issues/819>`_)
- Added support for ``wait_readable()`` and ``wait_writable()`` on ``ProactorEventLoop``
(used on asyncio + Windows by default)
- Fixed a misleading ``ValueError`` in the context of DNS failures
(`815 <https://github.com/agronholm/anyio/issues/815>`_; PR by graingert)
- Fixed the return type annotations of ``readinto()`` and ``readinto1()`` methods in the
``anyio.AsyncFile`` class
(`825 <https://github.com/agronholm/anyio/issues/825>`_)
- Fixed ``TaskInfo.has_pending_cancellation()`` on asyncio returning false positives in
cleanup code on Python >= 3.11
(`832 <https://github.com/agronholm/anyio/issues/832>`_; PR by gschaffner)
- Fixed cancelled cancel scopes on asyncio calling ``asyncio.Task.uncancel`` when
propagating a ``CancelledError`` on exit to a cancelled parent scope
(`790 <https://github.com/agronholm/anyio/pull/790>`_; PR by gschaffner)

- Fixed regression caused by (`807 <https://github.com/agronholm/anyio/pull/807>`_)
that prevented the use of parametrized async fixtures

This release contains all the changes from both v4.5.1 and v4.6.0, plus:

- Fixed TaskGroup and CancelScope producing cyclic references in tracebacks
when raising exceptions (`806 <https://github.com/agronholm/anyio/pull/806>`_)
(PR by graingert)

This release is the successor to v4.5.0 with Python 3.8 support dropped, and does not
contain the changes from v4.5.1.

- Dropped support for Python 3.8
(as `698 <https://github.com/agronholm/anyio/issues/698>`_ cannot be resolved
without cancel message support)
- Fixed 100% CPU use on asyncio while waiting for an exiting task group to finish while
said task group is within a cancelled cancel scope
(`695 <https://github.com/agronholm/anyio/issues/695>`_)
- Fixed cancel scopes on asyncio not propagating ``CancelledError`` on exit when the
enclosing cancel scope has been effectively cancelled
(`698 <https://github.com/agronholm/anyio/issues/698>`_)
- Fixed asyncio task groups not yielding control to the event loop at exit if there were
no child tasks to wait on
- Fixed inconsistent task uncancellation with asyncio cancel scopes belonging to a
task group when said task group has child tasks running

As Python 3.8 support was dropped in v4.6.0, this interim release was created to bring a
regression fix to Python 3.8, and adds a few other fixes also present in v4.6.1.

- Fixed acquiring a lock twice in the same task on asyncio hanging instead of raising a
``RuntimeError`` (`798 <https://github.com/agronholm/anyio/issues/798>`_)
- Fixed an async fixture's ``self`` being different than the test's ``self`` in
class-based tests (`633 <https://github.com/agronholm/anyio/issues/633>`_)
(PR by agronholm and graingert)
- Fixed ``TypeError`` with ``TLSStream`` on Windows when a certificate verification
error occurs when using a `truststore <https://github.com/sethmlarson/truststore>`_
SSL certificate (`795 <https://github.com/agronholm/anyio/issues/795>`_)
- Corrected documentation on ``anyio.Path`` regarding the limitations imposed by the
current Python version on several of its methods, and made the ``is_junction`` method
unavailable on Python versions earlier than 3.12
(`794 <https://github.com/agronholm/anyio/issues/794>`_)