Serhiy Storchaka <storchaka+cpyt...@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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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue41835>
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