map -package:containers -package:insert-ordered-containers -package:incipit-base -package:ghc -package:basement -package:invertible -package:foldl -package:hedgehog -package:psqueues -package:base-prelude -package:regex-tdfa package:case-insensitive

map :: FoldCase s2 => (s1 -> s2) -> CI s1 -> CI s2
case-insensitive Data.CaseInsensitive
Transform the original string-like value but keep it case insensitive.