GS.SpanModule for time duration
include Mavryk_stdlib.Compare.Sinclude Mavryk_base.TzPervasives.PRINTABLE with type t := tval pp : Stdlib.Format.formatter -> t -> unitval zero : tval of_int_s : int -> tval to_int_s : t -> intval of_float_s : float -> tval to_float_s : t -> float