[issue1569040] Speed up using + for string concatenation

[Raymond Hettinger]

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

I think lazy evaluation was discussed in the same thread.  Either I or
someone else suggested it and there was some issue because the string
struct had long been exposed and people were accessing it directly.

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<http://bugs.python.org/issue1569040>
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