code: public static <T, W extends Window> DeltaEvictor<T, W> of(double threshold, DeltaFunction<T> deltaFunction) {
  		return new DeltaEvictor<>(threshold, deltaFunction);
  	}
docs: Creates a {@code DeltaEvictor} from the given threshold and {@code DeltaFunction}.
  Eviction is done before the window function.
  
  @param threshold The threshold
  @param deltaFunction The {@code DeltaFunction}