[issue17615] String comparison performance regression

[Neil Hodgson]

Neil Hodgson added the comment:

The common cases are likely to be 1:1, 2:2, and 1:2. There is already a specialisation for 1:1. wmemcmp is widely available but is based on wchar_t so is for different widths on Windows and Unix. On Windows it would handle the 2:2 case.

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<http://bugs.python.org/issue17615>
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