[issue16001] small ints: cache string representation

[STINNER Victor]

STINNER Victor added the comment:

Oops, I forgot to attach the new patch: small_ints_cache_str-2.patch optimizes also str % args (copy the string when needed if the reference count is not 1).

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Added file: http://bugs.python.org/file27286/small_ints_cache_str-2.patch

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