include Ppx_sexp_conv_lib.Sexpable.S with type t := t
val t_of_sexp : Sexplib0.Sexp.t -> tval sexp_of_t : t -> Sexplib0.Sexp.tval of_int : int -> t optionval of_int_exn : int -> tval of_string : string -> t optionval of_string_exn : string -> tval to_string : t -> string