[issue1766304] improve xrange.__contains__

[Alexander Belopolsky]

Alexander Belopolsky <belopolsky at users.sourceforge.net> added the comment:

This is already in 3.x.  The only reason I can think of to get this in
2.7 is to have fewer performance surprises between 2.x and 3.x.

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<http://bugs.python.org/issue1766304>
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