[issue27938] PyUnicode_AsEncodedString, PyUnicode_Decode: add fast-path for "us-ascii" encoding

[Roundup Robot]

Roundup Robot added the comment:

New changeset 99818330b4c0 by Victor Stinner in branch 'default':
Issue #27938: Add a fast-path for us-ascii encoding
https://hg.python.org/cpython/rev/99818330b4c0

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nosy: +python-dev

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