map -package:containers -package:charset -package:invertible -is:exact -package:blaze-html -package:base -is:exact -package:foldl -is:exact -package:filepath -package:basement -is:exact 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.