Asgiref

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* Allow async-callables class instances to be passed to AsyncToSync
without warning

* Prevent giving async-callable class instances to SyncToAsync

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* sync_to_async in thread-sensitive mode now works corectly when the
outermost thread is synchronous (214)

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* Python 3.6 is no longer supported, and asyncio calls have been changed to
use only the modern versions of the APIs as a result

* Several causes of RuntimeErrors in cases where an event loop was assigned
to a thread but not running

* Speed improvements in the Local class

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* Fixed an issue with the deadlock detection where it had false positives
during exception handling.

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* Calling sync_to_async directly from inside itself (which causes a deadlock
when in the default, thread-sensitive mode) now has deadlock detection.

* asyncio usage has been updated to use the new versions of get_event_loop,
ensure_future, wait and gather, avoiding deprecation warnings in Python 3.10.
Python 3.6 installs continue to use the old versions; this is only for 3.7+

* sync_to_async and async_to_sync now have improved type hints that pass
through the underlying function type correctly.

* All Websocket* types are now spelled WebSocket, to match our specs and the
official spelling. The old names will work until release 3.5.0, but will
raise deprecation warnings.

* The typing for WebSocketScope and HTTPScope's `extensions` key has been
fixed.

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* The async_to_sync type error is now a warning due the high false negative
rate when trying to detect coroutine-returning callables in Python.