sig type 'a t = ('a, [ `sequencer ]) Throttle.T2.t val create : ?continue_on_error:bool -> 'a -> 'a Throttle.Sequencer.t val sexp_of_t : ('a -> Sexplib.Sexp.t) -> 'a Throttle.Sequencer.t -> Sexplib.Sexp.t end