*/
  public static double roundToDouble(BigDecimal x, RoundingMode mode) {
    return BigDecimalToDoubleRounder.INSTANCE.roundToDouble(x, mode);
  }

  private static final class BigDecimalToDoubleRounder extends ToDoubleRounder<BigDecimal> {
    static final BigDecimalToDoubleRounder INSTANCE = new BigDecimalToDoubleRounder();

    private BigDecimalToDoubleRounder() {}

    @Override

    return BigIntegerToDoubleRounder.INSTANCE.roundToDouble(x, mode);
  }

  @GwtIncompatible
  private static final class BigIntegerToDoubleRounder extends ToDoubleRounder<BigInteger> {
    static final BigIntegerToDoubleRounder INSTANCE = new BigIntegerToDoubleRounder();

    private BigIntegerToDoubleRounder() {}

    @Override