Yury Selivanov added the comment:

>> But why is this so different from the C implementation of lru_cache?

> I don't know.  Maybe C version of lru cache creates a bit less pressure on GC.

Actually test/refleak.py now cleans up typing's lru cache & calls 
"gc.collect()". It seems that the typing cycles aren't collectable by the GC 
when Python lru cache is used.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue28649>
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