STINNER Victor <vstin...@python.org> added the comment:

I'm not fully satisfied by the implementation of the two LRU types in 
functools. See the discussion in these two PRs:

https://github.com/python/cpython/pull/26363
https://github.com/python/cpython/pull/26423

The _lru_list_elem doesnt implement the GC protocol for performance reasons:

* https://bugs.python.org/issue32422
* https://github.com/python/cpython/pull/5008/files

But I'm not sure if it's ok that _lru_list_elem doesn't implement the GC 
protocol: it's disucssion in this issue.

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<https://bugs.python.org/issue42972>
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