code: public final <U> U as(Function<? super ParallelFlux<T>, U> converter) {
  		return converter.apply(this);
  	}
docs: Perform a fluent transformation to a value via a converter function which receives
  this ParallelFlux.
  
  @param <U> the output value type
  @param converter the converter function from {@link ParallelFlux} to some type
  
  @return the value returned by the converter function