code: public static final IntStream toDigits(long v, int length, int radix)
      {
          Spliterator.OfInt spliterator = Spliterators.spliterator(new PRimIt(v, length, radix), Long.MAX_VALUE, 0);
          return StreamSupport.intStream(spliterator, false);
      }
docs: Returns IntStream where each item is a digit. I.e zero leading digits.
  @param v
  @param length
  @param radix
  @return