Bug: backoff raises ZeroDivisionError when factor=1.0 and count is not specified

Bug: backoff raises ZeroDivisionError when factor=1.0 and count is not specified: a task in repo2rlenv-swe-next (Harbor dataset). When calling backoff (or backoff iter ) with factor=1.0 and no explicit count , a ZeroDivisionError is raised instead of either returning a sensible result or raising a…