Module Observer.Update
type 'a t= 'a Observer.Update.t=|Initialized of 'a|Changed of 'a * 'a|Invalidated
val compare : ('a -> 'a -> int) -> 'a t -> 'a t -> intval sexp_of_t : ('a -> Ppx_sexp_conv_lib.Sexp.t) -> 'a t -> Ppx_sexp_conv_lib.Sexp.t