[issue44310] Document that lru_cache uses hard references

[Raymond Hettinger]

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

Also note that many important objects in Python are not weak referenceable, tuples for example.

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title: lru_cache memory leak -> Document that lru_cache uses hard references

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue44310>
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