[docs] [issue33470] Changes from GH-1638 (GH-3575, bpo-28411) are not documented in Porting to Python 3.7

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

Miro: do you want to work on a pull request?

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33470>
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