`sig
type t
val invariant : t Invariant_intf.inv
val max_num_bits : int
val create_exn : int list -> Timing_wheel_intf.Timing_wheel.Level_bits.t
val default : Timing_wheel_intf.Timing_wheel.Level_bits.t
val num_bits : Timing_wheel_intf.Timing_wheel.Level_bits.t -> int
val t_of_sexp :
Sexplib.Sexp.t -> Timing_wheel_intf.Timing_wheel.Level_bits.t
val sexp_of_t :
Timing_wheel_intf.Timing_wheel.Level_bits.t -> Sexplib.Sexp.t
end`