[issue28556] typing.py upgrades

[Ned Deily]

Ned Deily <nad at python.org> added the comment:


New changeset b0576278b2d44472c73696f6dea4855f7ffb7ff1 by Ned Deily (Miss Islington (bot)) in branch '3.6':
[bpo-28556] Minor fixes for typing module (GH-4710) (#4713)
https://github.com/python/cpython/commit/b0576278b2d44472c73696f6dea4855f7ffb7ff1


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