[issue16562] Optimize dict equality test

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Here is a simple patch.

> Note, the optimized path should be used only when PyDict_CheckExact() is true.

Actually this is not needed. dict_equal() uses the same code for dict subclasses.

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keywords: +patch
nosy: +serhiy.storchaka
stage:  -> patch review
Added file: http://bugs.python.org/file28137/dict_equal_hash_reuse.patch

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