[issue41835] Speed up dict vectorcall creation using keywords

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Both changes add significant amount of code (100 and 85 lines correspondingly). Even if they speed up a particular case of dict constructor it is not common use case.

I think that it would be better to reject these changes. They make maintenance harder, the benefit seems insignificant, and there is always a danger that new code can slow down other code. The dict object is performance critical for python, so it is better to not touch its code without need.

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nosy: +serhiy.storchaka

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<https://bugs.python.org/issue41835>
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