[issue1045] Performance regression in 2.5

[Raymond Hettinger]

Raymond Hettinger added the comment:

I'll take a look at it next week -- want to think through the various 
cases.  The current setup provides nice speedups when the length_hint 
is available.  Possibly, it may be worthwhile to skip that check when 
the input is a generator.  For the most part, I'm more concerned about 
the inner-loop time than the constant startup time outside the loop.

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