docs: public final static <T> Tuple2<Stream<T>, Stream<T>> partition(final Stream<T> stream, final Predicate<? super T> splitter) {
          final Tuple2<Stream<T>, Stream<T>> Tuple2 = duplicate(stream);
          return Tuple.tuple(
                            Tuple2._1().filter(splitter), Tuple2._2().filter(splitter.negate()));
      }