[issue21101] Extend the PyDict C API to handle cases where the hash value is known

[Roundup Robot]

Roundup Robot added the comment:

New changeset 592a57682ced by Raymond Hettinger in branch 'default':
Issue #21101:  Eliminate double hashing in the C code for collections.Counter().
http://hg.python.org/cpython/rev/592a57682ced

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21101>
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