Puts the current value and previous value together as an array, and queues that.
--a----b------c------d------pairwise()-------[a,b]--[b,c]--[c,d]-- Copy
--a----b------c------d------pairwise()-------[a,b]--[b,c]--[c,d]--
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Puts the current value and previous value together as an array, and queues that.