[issue40504] Restore weakref support for lru_cache wrappers

[Raymond Hettinger]

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


New changeset 1253c3ef70ea5632d32ae19579a14152db0d45c1 by Dennis Sweeney in branch 'master':
bpo-40504: Allow weakrefs to lru_cache objects (GH-19938)
https://github.com/python/cpython/commit/1253c3ef70ea5632d32ae19579a14152db0d45c1


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