map -package:base-compat -package:dense-linear-algebra -package:basement -package:containers -package:psqueues -package:dlist -package:charset -package:base-prelude -package:filepath 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.