map is:exact -package:vector -package:base-compat-batteries -package:blaze-html -package:base-prelude -package:basement -package:invertible -package:case-insensitive -package:foldl -package:conduit -package:hedgehog -package:os-string -package:insert-ordered-containers package:monoidal-containers
O(n) Transform this map by applying a function to every value.