Jason Evans 45a5bf6772 Do not advance decay epoch when time goes backwards.
Instead, move the epoch backward in time.  Additionally, add
nstime_monotonic() and use it in debug builds to assert that time only
goes backward if nstime_update() is using a non-monotonic time source.
2016-10-10 22:31:37 -07:00
..
2016-05-07 16:55:36 -07:00
2016-03-23 16:15:42 -07:00
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