Message8163

Our implementation of the unicode type does not always deal correctly with those codepoints represented by surrogate pairs. For example:
>>> s = u"\U00010000a"
>>> s.index('a')
2
>>> s[1]
u'a'

This definitely affects the "find" family of methods (find, rfind, index, rindex) in their simplest for. In other cases, the fault is more
subtle, being revealed only when a sub-range is the effective target.

>>> s = u"\U00010000hello world"
>>> s.startswith("hell",1)
False
>>> s.startswith("hell",2)
True