range() with large step causes undefined behaviour
With positive step, range(start, stop, step) translates roughly like:
def range(start, stop, step): cur = start while cur < stop: yield cur cur += step
Signed integer overflow, which is undefined behaviour in C, may happen on the line
cur += step, e.g. if start + step > sys.maxint.
Note: this caused the issue fixed in be2a55c81f26
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