Seeing as the range type has most likely stabalised by now, I would like
to renew this issue.  The current behaviour of range/xrange could
introduce unforeseen performance issues if users are not aware of its
inner workings.

Also, as I said in my closed duplicate issue, 'if value in range(lower,
upper)' to me looks far more Pythonic than 'if value >= lower and value
< upper'.  Although this may be a minor point, I think it is noteworthy.

As for the prospect of producing a patch myself, I have checked out and
taken a look at the code, but it is somewhat alien to me, and I thought
it'd probably be more sensible to leave it to the people who know what
they're doing.