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range() treated amount as both the step and the termination increment with no validation, so amount=0 yielded the start forever and a mismatched sign walked away from the end. Reject a zero amount with ValueError. A negative amount whose sign does not match the interval direction now yields an empty iterator, matching Python range().
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Fixes #1080
Interval.range(unit, amount)usedamountas both the step and the loop increment with no validation.amount=0therefore yielded the start forever (start.add(days=0)never moves, sostart <= endstays true). A negative amount on a forward interval walked away from the end instead of terminating.Reject a zero amount with
ValueError. A negative amount whose sign does not match the interval direction now yields an empty iterator, the same way Python'srange()does. Existing positive-amount ranges are unchanged.