Hrvoje Nikšić <hnik...@gmail.com> added the comment:

I didn't start working on the PR, so please go ahead if you're interested.

One small suggestion: If you're implementing this, please note that the 
proof-of-concept implementation shown in the description is not very efficient 
because each call to `wait` has to iterate over all the futures (which can be 
potentially large in number) to set up and tear down the done callbacks on each 
one. A more efficient implementation would set up the callbacks only once - see 
https://stackoverflow.com/a/51403277/1600898 for an example.

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<https://bugs.python.org/issue33533>
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