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The patch is not meant to be loaded to UserString.  Rather
it is a proof-of-concept demonstration of how deferred
string addition would work. Even it pure python form, it
shows how to convert an O(n**2) process to O(n).  If the
concept is approved, the goal is to alter the C code for
stringobject.c, unicodeobject.c, and to make a more thorough
version for UserString.