Merged revisions 76916 via svnmerge from

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  r76916 | mark.dickinson | 2009-12-20 13:58:18 +0000 (Sun, 20 Dec 2009) | 3 lines

  math.factorial depends on PyLong_AsLong correctly converting floats; rewrite
  it to do the conversion explicitly instead.  See issue #7550.
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