[issue28183] Clean up and speed up dict iteration

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

It looks to me that the patch contain unneeded changes. Some changes don't affect performance, others don't look well justified. Are there benchmarks that confirm the benefit of these changes?

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28183>
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