[issue29318] Optimize _PyFunction_FastCallDict() for **kwargs

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> It can reduce number of hash() calls.

Keys are strings (even interned strings), and hashes are cached.

In most cases kw is empty or very small. I doubt any optimization can have significant effect.

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nosy: +serhiy.storchaka

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