[issue28649] refleak in typing.py

[Yury Selivanov]

Yury Selivanov added the comment:

> Does that patch fix the refleak completely or only partially?

I tried to empty the cache in test_typing.BaseTestCase.setUp and tearDown; this doesn't fix all refleaks.

Do we have some other caches in typing.py?

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<http://bugs.python.org/issue28649>
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