This behaviour is deprecated and will be removed in future versions
of Python. Technically, it could be considered a bug (invalid usage
causing different behaviour from the expected one), and in practice
it should not break much code (because .get_event_loop() would likely
be the same event loop anyway).
This should make it easier to maintain these methods, increase
reusability, and get rid of the async_generator dependency.
In the future, people could use this to more easily deal with
raw API themselves.
