Sourceval get_item : string -> ('a -> unit) -> unit Sourceval get_items : string list -> ('a -> unit) -> unit Sourceval get_keys : (string list -> unit) -> unit Sourceval set_item : string -> 't8 -> unit Sourceval get : ?key:string -> 'a -> ('b -> unit) -> unit Sourceval get_arr : ?keys:string list -> 'a -> ('b -> unit) -> unit Sourceval remove : ?callback:(unit -> unit) -> 'a -> string -> unit Sourceval clear : ?callback:(unit -> unit) -> 'a -> unit