* Support context manager protocol by :class:`contextvars.Token`.

(Contributed by Andrew Svetlov in :gh:`129889`.)

* Add the optional ``buffersize`` parameter to

:meth:`concurrent.futures.Executor.map` to limit the number of submitted

tasks whose results have not yet been yielded. If the buffer is full,

iteration over the *iterables* pauses until a result is yielded from the

buffer.

(Contributed by Enzo Bonnal and Josh Rosenberg in :gh:`74028`.)

ctypes