Uchar

`sig
type t
val min : Uchar.t
val max : Uchar.t
val bom : Uchar.t
val rep : Uchar.t
val succ : Uchar.t -> Uchar.t
val pred : Uchar.t -> Uchar.t
val is_valid : int -> bool
val of_int : int -> Uchar.t
val unsafe_of_int : int -> Uchar.t
val to_int : Uchar.t -> int
val is_char : Uchar.t -> bool
val of_char : char -> Uchar.t
val to_char : Uchar.t -> char
val unsafe_to_char : Uchar.t -> char
val equal : Uchar.t -> Uchar.t -> bool
val compare : Uchar.t -> Uchar.t -> int
val hash : Uchar.t -> int
end`