val item : int -> t -> string option
val add : string -> t -> unit
val addMany : string array -> t -> unit
val contains : string -> t -> bool
val forEach : (string -> int -> unit) -> t -> unit
val remove : string -> t -> unit
val removeMany : string array -> t -> unit
val replace : string -> string -> t -> unit
val supports : string -> t -> bool
val toggle : string -> t -> bool
val toggleForced : string -> t -> bool
val toString : t -> string
val setValue : t -> string -> unit