Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:

Simon, please keep the original version fast by creating two code paths:

   if key is None:
      original_code
   else:
      new_code using the key_function

----------
priority: normal -> low

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue13742>
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