[issue2690] Precompute range length

[Alexander Belopolsky]

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

Reviewing my own patch (range-sequence.diff), I've realized that it is 
being a bit too clever in handling x in range(..) where x is not an 
integer.  It seems that upon a failed PyLong_Check, range_contains should 
just do a linear search.  This is easy to implement, but I will wait for 
more feedback before posting further changes.

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