Sequence.Merge_with_duplicates_element
val hash_fold_t : (Hash.state -> 'a -> Hash.state) -> (Hash.state -> 'b -> Hash.state) -> Hash.state -> ('a, 'b) t -> Hash.state
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