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

[Yury Selivanov]

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

> Let's get it into master for 3.8 first and then we'll have something to discuss.

The PR has a "versionadded" tag.  If you plan to allow this, Andrew can commit it set to 3.7...

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