[docs] [issue24509] Undocumented features of asyncio: call_at, call_later

[Марк Коренберг]

Марк Коренберг added the comment:

For delayed execution methods:

"Returned handle is actually timer object. That timer can be deactivated using asyncio.Handle.cancel() method, so registered callback won't be called".

For other callback registration methods:

"Returned handle may be used to unregister callback using asyncio.Handle.cancel(), so registered callback won't be called".


Also:
1. Documentation of .cancel does not say if it is allowed to cancel cancelled handle.
2. Documentation does not say if it is allowed to cancel timer, that was already fired.

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<http://bugs.python.org/issue24509>
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