map -package:containers is:exact -package:conduit -package:dlist -package:bytestring -package:dense-linear-algebra -package:imports -package:basement -package:psqueues -package:aeson -package:base-compat -package:os-string -package:case-insensitive -package:unordered-containers -package:base package:charset

map :: (Char -> Char) -> CharSet -> CharSet
charset Data.CharSet