Thomas Grainger <tagr...@gmail.com> added the comment:

> using a per-descriptor `WeakKeyDictionary` to map the instance to locks 
> (which would of course not work - is there any way to map unhashable 
> instances weakly?)

there's an issue for that too: https://bugs.python.org/issue44140

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue43468>
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