map is:exact -package:text -package:base-compat-batteries -package:bytestring -package:base-compat -package:case-insensitive -package:charset -package:filepath -package:Cabal-syntax -package:imports -package:ghc -package:foldl -package:base-prelude package:monoidal-containers
O(n) Transform this map by applying a function to every value.