type 'a t
= 'a Incremental__.Types.Internal_observer.t
val same : _ t -> _ t -> bool
val observing : 'a t -> 'a Incremental__.Node.t
val use_is_allowed : _ t -> bool
val value_exn : 'a t -> 'a
val on_update_exn : 'a t -> 'a Incremental__.On_update_handler.t -> unit
val unlink : _ t -> unit