The implementation of clojure.core/get returns nil if its argument is not an associative collection.
This behavior can obscure common programmer errors such as:
Calling get on something which is neither nil nor an Associative collection is almost certainly a bug, and should be indicated by an exception.
CLJ-932 was accepted as a similar enhancement to clojure.core/contains?
Approach: Throw IllegalArgumentException as final fall-through case in RT.getFrom instead of returning nil.
Also see: CLJ-969