sig
type t
exception Bad_encoding
val of_char : char -> Utf8_char.t
val of_bytes : string -> Utf8_char.t
val to_bytes : Utf8_char.t -> string
val size : Utf8_char.t -> int
val to_U_char : Utf8_char.t -> U_char.t
val utf8_character_size : int -> int
end