Clojurians Log v2

Given that vector? has no implicit unformer function in spec 1, is there a preferred way to unform some input sequence into a vector? The main 2 I was thinking of were an additional unformer (mentioned in previous asks) or swapping to coll-of, but I imagine coll-of comes with a performance hit on long sequences since it runs the predicate against every element even if it's any?. Unfortunately no catv in spec 1 nor does cat support something like coll-of's :into so this hack is needed. On a separate note, is conform/unform being isomorphic a design goal for spec 2? Spec seems to also (unintentionally?) function as a parser/deserializer + serializer.