bugfix: queue: uint64 is never less than 0

[detailyang]

diff should be int64 else it never less than 0

[aviary2-wf]

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[detailyang]

It looks like some tests broken, because the diff is actually below 0

[ryanjackson-wf]

Thank you for pointing out this bug. I might be inclined to do the math by hand as it were with the raw unsigned numbers (in perhaps a helper method) to ensure that those int64 conversions don't bite us for very large values.