[issue40504] Restore weakref support for lru_cache wrappers

[Raymond Hettinger]

Raymond Hettinger <raymond.hettinger at gmail.com> added the comment:

Yes.  That is the desired behavior.  Use Objects/setobject.c and Include/setobject.h as a model.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40504>
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