[issue19424] _warnings: patch to avoid conversions from/to UTF-8

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I don't see a benefit from this patch. _PyUnicode_AsString() is very fast in most cases (because source lines are mostly ASCII only). On other hand, the patch replaces one-time _PyUnicode_AsString() by multiple less effective (even for ASCII strings) operations.

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nosy: +serhiy.storchaka

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