[issue30040] new empty dict can be more small

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Use "--duplicate 100" when making microbenchmarks for such fast operations. The overhead of iterating can be significant and comparable with the time of the operation.

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nosy: +serhiy.storchaka
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30040>
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