Blocked revisions 70149 via svnmerge

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  r70149 | raymond.hettinger | 2009-03-03 16:59:25 -0600 (Tue, 03 Mar 2009) | 5 lines

  Backport 70140, 70141, 70143, and 70144.
  Adds tests, switches from list to deque, fixes __reduce__
  which was unnecessarily copying __keys.
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