Case folding
val fold : Stdlib.Uchar.t -> [ `Self | `Uchars of Stdlib.Uchar.t list ]fold u is u's Case_Folding property.
Case.FoldCase folding.
val fold : Stdlib.Uchar.t -> [ `Self | `Uchars of Stdlib.Uchar.t list ]fold u is u's Case_Folding property.