[issue28649] refleak in typing.py

[Yury Selivanov]

Yury Selivanov added the comment:

> Yury, _tp_cache should be the only one (of course most generic classes have _abc_cache since GenericMeta inherits from ABCMeta)

Then there is at least one more bug not related to lru_cache (or any kind of cache in typing).

And it's not classes-with-empty-slots bug either.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28649>
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