[issue14687] Optimize str%tuple for the PEP 393

[STINNER Victor]

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

Updated patch:
 - use also PyUnicode_Kind for kind and fmtkind
 - fix compiler warnings
 - initialize data outside the loop
 - avoid duplicate PyUnicode_READ() where it is possible
 - minor code cleanup

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Added file: http://bugs.python.org/file25413/pyunicode_format-2.patch

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