merge(with:)
Declaration
func merge<P>(with other: P) -> Publishers.Merge3<A, B, P> where P : Publisher, B.Failure == P.Failure, B.Output == P.Outputfunc merge<P>(with other: P) -> Publishers.Merge3<A, B, P> where P : Publisher, B.Failure == P.Failure, B.Output == P.Output