I was expecting (partition-all n step coll) to be equal to (partition n step nil coll) but that's not always the case.
(partition-all 3 1 (range 5))
;=> ((0 1 2) (1 2 3) (2 3 4) (3 4) (4))
;; Notice the second to last partition is (3 4). Why not stop there?
;; My work-around is to use a nil pad. This gives my expected result
(partition 3 1 nil (range 5))
;=> ((0 1 2) (1 2 3) (2 3 4) (3 4))
