Fix zero task limit for reverse ranges - #3444
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Description
Ensure reverse range tasks with
task_limit=0require no missing tasks instead of treating[-0:]as the entire list. Add regression coverage for this behavior.Motivation and Context
RangeBase.requires()limits reverse scheduling usingmissing_datetimes[-self.task_limit:]. In Python,-0is0, so a zerolimit selects the entire missing backlog rather than selecting no tasks.
Testing
task_limit=0test/range_test.py: 58 passed