map -package:charset -is:exact -is:exact -package:Cabal-syntax -is:exact -package:filepath -package:base-prelude -package:dlist is:exact -package:base-compat 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.