Documentation

https://docs.python.org/3/library/asyncio-future.html#asyncio.isfuture

The link above describes:

a Future-like object with a _asyncio_future_blocking attribute.

However, it doesn't say exactly what constitutes "Future-like".

Since asyncio.Task and asyncio.Future both fit this test, I'm assuming it is the set (or a subset?) of the methods shared by both of these classes.

Asking because I have a custom awaitable object that was being passed to asyncio.wait() that worked in the past but broke in Python 3.11 because is is missing a add_done_callback() method.

So...

1. Can we get a formal definition in the docs?
2. Taking it one step farther, should there be a typing.Protocol for "Future-like"?