[issue28649] refleak in typing.py

[Guido van Rossum]

Guido van Rossum added the comment:

Serhiy, why is `gc.collect()` returning 2 after `del A` proof of a leak?
Yes, there's a cycle, but it's being GC'ed -- isn't that fine? Without the
slots the collect() call returns a larger number.

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