include Common with type t = Datatype.String.Set.t
val get : string -> unit -> tval set : string -> t -> unitval clear : string -> unit -> unitval is_set : string -> unit -> boolval is_default : string -> unit -> boolval add : string -> string -> unitval remove : string -> string -> unitval is_empty : string -> unit -> boolval iter : string -> (string -> unit) -> unit