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

Using a weak dictionary is not a correct solution as the cache must take string 
ownership of the arguments and return value to do it's job properly. Moreover, 
there are many types in Python that don't support weak references so this will 
be a backwards incompatible change and limiting the cache quite a lot.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue44310>
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