[Python-Dev] RFC: Add a new builtin strarray type to Python?

["Martin v. Löwis"]

> I restored this hack in Python 3.3 using PyUnicode_Append() in ceval.c and by 
> optimizing PyUnicode_Append() (try to append in-place). str+=str is closer 
> again to ''.join:

Why are you checking, in unicode_resizable, whether the string is from
unicode_latin1? If it is, then it should have a refcount of at least 2,
so the very first test in the function should already exclude it.

Regards,
Martin