[issue14744] Use _PyUnicodeWriter API in str.format() internals

[STINNER Victor]

STINNER Victor <victor.stinner at gmail.com> added the comment:

> When posting benchmark numbers, can you please only compared
> patched against unpatched?

Here you have: REPORT_64BIT_PATCH.

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Added file: http://bugs.python.org/file25690/REPORT_64BIT_PATCH

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