[issue1569040] Speed up using + for string concatenation

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

IIRC, this has already been rejected on python-dev in a number of
discussions (check for "ropes" in the search).  Also, Armin has long ago
implemented some optimizations for string concatenation in a number of
contexts.

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nosy: +rhettinger

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