[issue1564] The set implementation should special-case PyUnicode instead of PyString

[Raymond Hettinger]

Raymond Hettinger added the comment:

The patch doesn't parallel what was done for dicts.  The code in 
dictobject.c does not use a macro.  It special cases for PyUnicode but 
not PyString.  Please submit a patch that mirrors what was done for 
dicts.

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