# Module Packed_array.Int64

    module Int64: S  with type elt := int64

    include Packed_array.Basic

    include Sexpable.S

    include Binable.S

    val get : t -> int -> elt

    val slice : t -> pos:int -> len:int -> t

    val iter : t -> f:(elt -> unit) -> unit

    val fold : t -> init:'a -> f:('a -> elt -> 'a) -> 'a

    val of_array : elt array -> t

    val to_array : t -> elt array

    val of_list : elt list -> t

    val to_list : t -> elt list

    val empty : t