Merged revisions 81414 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/trunk

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  r81414 | benjamin.peterson | 2010-05-21 15:51:45 -0500 (Fri, 21 May 2010) | 1 line

  return NotImplemented from Mapping when comparing to a non-mapping #8729
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