Merged revisions 86159 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/branches/py3k

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  r86159 | hirokazu.yamamoto | 2010-11-04 21:09:08 +0900 | 2 lines

  Issue #5391: mmap.read_byte() should return unsigned value [0, 255]
  instead of signed value [-127, 128].
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