map -package:containers -package:imports -package:base-compat is:exact -package:dlist -package:basement -package:os-string -package:invertible -package:psqueues -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.