code: public final <T2> Flux<Tuple2<T, T2>> zipWith(Publisher<? extends T2> source2, int prefetch) {
  		return zipWith(source2, prefetch, tuple2Function());
  	}
docs: Zip this {@link Flux} with another {@link Publisher} source, that is to say wait
  for both to emit one element and combine these elements once into a {@link Tuple2}.
  The operator will continue doing so until any of the sources completes.
  Errors will immediately be forwarded.
  This "Step-Merge" processing is especially useful in Scatter-Gather scenarios.
  
  <p>
  <img class="marble" src="doc-files/marbles/zipWithOtherForFlux.svg" alt="">
  
  @param source2 The second source {@link Publisher} to zip with this {@link Flux}.
  @param prefetch the request size to use for this {@link Flux} and the other {@link Publisher}
  @param <T2> type of the value from source2
  
  @return a zipped {@link Flux}