code: @SuppressWarnings("unchecked")
      public final static <T> Tuple4<Stream<T>, Stream<T>, Stream<T>, Stream<T>> quadruplicate(final Stream<T> stream) {
          final Stream<Stream<T>> its = Streams.toBufferingCopier(stream.iterator(), 4)
                                                   .stream()
                                                   .map(it -> Streams.stream(it));
          final Iterator<Stream<T>> it = its.iterator();
          return new Tuple4(
                            it.next(), it.next(), it.next(), it.next());
      }
docs: Makes four copies of a Stream
  Buffers intermediate values, leaders may change positions so a limit
  can be safely applied to the leading stream. Not thread-safe.
  
  <pre>
  {@code
  
  Tuple4<ReactiveSeq<Tuple4<T1,T2,T3,T4>>,ReactiveSeq<Tuple4<T1,T2,T3,T4>>,ReactiveSeq<Tuple4<T1,T2,T3,T4>>,ReactiveSeq<Tuple4<T1,T2,T3,T4>>> quad = sequence.quadruplicate();
  
  }
  </pre>
  @return