[issue28649] refleak in typing.py

[Ivan Levkivskyi]

Ivan Levkivskyi added the comment:

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

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