492     arbitrary bytes into an internal Unicode format that can be

   492     arbitrary bytes into an internal Unicode format that can be

   493     re-encoded back into the original. Here we are exposing the

   493     re-encoded back into the original. Here we are exposing the

   494     internal surrogate encoding as a UTF-8 string.)

   494     internal surrogate encoding as a UTF-8 string.)

   495     '''

   495     '''

   496 

   496 

   497     if "\xed" not in s:

   499     if "\xed" not in s:

   498         if isinstance(s, localstr):

   500         if isinstance(s, localstr):

   499             return s._utf8

   501             return s._utf8

   500         try:

   502         try:

   501             s.decode('utf-8')

   503             s.decode('utf-8')

   542     True

   544     True

   543     >>> roundtrip("\\xf1\\x80\\x80\\x80\\x80")

   545     >>> roundtrip("\\xf1\\x80\\x80\\x80\\x80")

   544     True

   546     True

   545     '''

   547     '''

   546 

   548 

   547     # fast path - look for uDxxx prefixes in s

   551     # fast path - look for uDxxx prefixes in s

   548     if "\xed" not in s:

   552     if "\xed" not in s:

   549         return s

   553         return s

   550 

   554 

   551     # We could do this with the unicode type but some Python builds

   555     # We could do this with the unicode type but some Python builds