The kind of a vertex, either a Node or a Leaf.
val set : marker:(unit -> unit) -> bytes -> off:int -> t -> unitset marker buff off t sets the field value in buff at offset off. marker is a function to mark a page as dirty.
val get : bytes -> off:int -> tval to_t : Btree__.Field_intf.kind -> tval from_t : t -> Btree__.Field_intf.kindval pp_raw : Format.formatter -> bytes -> off:int -> unitval of_depth : int -> tof_depth depth returns the kind of a vertex based on its depth.
val to_depth : t -> intto_depth t returns the depth a vertex from its kind.