Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:

> It should use "(id(instance), instance)" rather than just "instance" as the 
> key.

It should use a dict with id(instance) as a key and instance as value. An 
instance can be non-hashable.

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