type t = row
val empty : t
val make1 : data -> t
val make2 : data -> data -> t
val of_array : data array -> t
val of_list : data list -> t
val size : t -> int
val get : int -> t -> data option
val get_exn : int -> t -> data
if the index is not valid
val map : f:(data -> data) -> t -> t
val append : t -> t -> t
val remove_index : int -> t -> t
val remove_index_l : int list -> t -> t
val print : t printer
val to_string : t -> string
