[issue32741] Add asyncio.TimerHandle.when() function

[Yury Selivanov]

Yury Selivanov <yselivanov at gmail.com> added the comment:

The PR is LGTM.  Up to Ned to allow this in 3.7.  I agree that the feature is (a) trivial, (b) new, so it's safe to go in 3.7.

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