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

[STINNER Victor]

Changes by STINNER Victor <victor.stinner at gmail.com>:


Added file: http://bugs.python.org/file25688/REPORT_64BIT_3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14744>
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