code: @SafeVarargs
      public static <T> StreamEx<T> of(T... elements) {
          return of(Arrays.spliterator(elements));
      }
docs: Returns a sequential ordered {@code StreamEx} whose elements are the
  specified values.
  
  @param <T> the type of stream elements
  @param elements the elements of the new stream
  @return the new stream
  @see Stream#of(Object...)