map is:exact -package:text -package:Cabal-syntax -package:basement -package:base-prelude -package:charset -package:base-compat -package:insert-ordered-containers -package:base-compat-batteries -package:aeson -package:filepath -package:dense-linear-algebra -package:case-insensitive package:monoidal-containers
O(n) Transform this map by applying a function to every value.