[issue18531] Undocumented different between METH_KEYWORDS and **kws

[Roundup Robot]

Roundup Robot added the comment:

New changeset e4835b1ed7b1 by Serhiy Storchaka in branch 'default':
Issue #18531: Single var-keyword argument of dict subtype was passed
https://hg.python.org/cpython/rev/e4835b1ed7b1

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nosy: +python-dev

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<http://bugs.python.org/issue18531>
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