[issue28832] Reduce memset in dict creation

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I think that clearing 120 bytes at a time is faster than clear it later entry-by-entry.

Your patch removes some asserts, this looks not good.

Could your provide microbenchmarks that show the largest speed up and the largest slow down? So we would see what type of code gets the benefit.

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nosy: +serhiy.storchaka

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