[issue29318] Optimize _PyFunction_FastCallDict() for **kwargs

[Roundup Robot]

Roundup Robot added the comment:

New changeset fcba9c9d987b by Victor Stinner in branch 'default':
Document that _PyFunction_FastCallDict() must copy kwargs
https://hg.python.org/cpython/rev/fcba9c9d987b

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nosy: +python-dev

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<http://bugs.python.org/issue29318>
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