Pablo Galindo Salgado <pablog...@gmail.com> added the comment:

Just also to be clear on my original message, reverting it to a previous 
behaviour would disallow some patterns that could be useful:

>>> class A:
...   ...
...
>>> a = A()
>>> d = {a: None}
>>> weakref.proxy(a) in d
True

But I agree is better to revert back in any case

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue44523>
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