type ('a, 'b) t = ('a, 'b) Sequence.Merge_with_duplicates_element.t =
| Left of 'a
| Right of 'b
| Both of 'a * 'b
include Sexpable.S2 with type ('a, 'b) t := ('a, 'b) t
val t_of_sexp : (Sexplib0.Sexp.t -> 'a) -> (Sexplib0.Sexp.t -> 'b) -> Sexplib0.Sexp.t -> ('a, 'b) t
val sexp_of_t : ('a -> Sexplib0.Sexp.t) -> ('b -> Sexplib0.Sexp.t) -> ('a, 'b) t -> Sexplib0.Sexp.t