Merged revisions 72574 via svnmerge from

Merged revisions 72574 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/branches/py3k

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  r72574 | r.david.murray | 2009-05-11 21:40:16 -0400 (Mon, 11 May 2009) | 10 lines

  Merged revisions 72572 via svnmerge from
  svn+ssh://pythondev@svn.python.org/python/trunk

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    r72572 | r.david.murray | 2009-05-11 21:36:57 -0400 (Mon, 11 May 2009) | 3 lines

    Make it clear up front that shelve only records changes
    when objects are assigned back to it when writeback is False.
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