map -package:charset -is:exact -is:exact -package:blaze-html -package:bytestring is:exact -package:basement -package:conduit -package:filepath -package:psqueues 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.