code: public final Flux<T> ordered(Comparator<? super T> comparator) {
  		return ordered(comparator, Queues.SMALL_BUFFER_SIZE);
  	}
docs: Merges the values from each 'rail', but choose which one to merge by way of a
  provided {@link Comparator}, picking the smallest of all rails. The result is
  exposed back as a {@link Flux}.
  <p>
  This version uses a default prefetch of {@link Queues#SMALL_BUFFER_SIZE}.
  
  @param comparator the comparator to choose the smallest value available from all rails
  @return the new Flux instance
  
  @see ParallelFlux#ordered(Comparator, int)