[issue43468] functools.cached_property incorrectly locks the entire descriptor on class instead of per-instance locking

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at 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 <report at bugs.python.org>
<https://bugs.python.org/issue43468>
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