code: @Override
      public long getAmountFractionNumerator() {
          BigDecimal bd = ConvertBigDecimal.of(number).remainder(BigDecimal.ONE);
          return bd.movePointRight(getScale()).longValueExact();
      }
docs: /*
  (non-Javadoc)
  @see javax.money.NumberValue#getAmountFractionNumerator()