Map.Keytype t = tinclude Ppx_sexp_conv_lib.Sexpable.S with type t := tval t_of_sexp : Sexplib0.Sexp.t -> tval sexp_of_t : t -> Sexplib0.Sexp.tinclude Core_kernel.Comparator.S with type t := t with type comparator_witness = comparator_witnesstype comparator_witness = comparator_witnessval comparator : (t, comparator_witness) Core_kernel.Comparator.comparator