}

  public void testDoubleValue() {
    for (int value : TEST_INTS) {
      UnsignedInteger unsignedValue = UnsignedInteger.fromIntBits(value);
      assertThat(unsignedValue.doubleValue())
          .isEqualTo(unsignedValue.bigIntegerValue().doubleValue());
    }
  }

  public void testPlus() {
    for (int a : TEST_INTS) {
      for (int b : TEST_INTS) {
        UnsignedInteger aUnsigned = UnsignedInteger.fromIntBits(a);

    for (int i = 0, n = 0; n <= DoubleMath.MAX_FACTORIAL; i++, n += 16) {
      assertThat(DoubleMath.everySixteenthFactorial[i])
          .isEqualTo(BigIntegerMath.factorial(n).doubleValue());
    }
  }

  @GwtIncompatible // DoubleMath.roundToInt(double, RoundingMode)
  public void testRoundIntegralDoubleToInt() {
    for (double d : INTEGRAL_DOUBLE_CANDIDATES) {

   */
  @Override
  public float floatValue() {
    return (float) get();
  }

  /** Returns the value of this {@code AtomicDouble} as a {@code double}. */
  @Override
  public double doubleValue() {
    return get();
  }

  /**
   * Saves the state to a stream (that is, serializes it).
   *
   * @serialData The current value is emitted (a {@code double}).
   */

    checkArgument(values.hasNext(), "Cannot take mean of 0 values");
    long count = 1;
    double mean = checkFinite(values.next().doubleValue());
    while (values.hasNext()) {
      double value = checkFinite(values.next().doubleValue());
      count++;
      // Art of Computer Programming vol. 2, Knuth, 4.2.2, (15)
      mean += (value - mean) / count;
    }
    return mean;
  }

   */
  public static double meanOf(Iterator<? extends Number> values) {
    checkArgument(values.hasNext());
    long count = 1;
    double mean = values.next().doubleValue();
    while (values.hasNext()) {
      double value = values.next().doubleValue();
      count++;
      if (isFinite(value) && isFinite(mean)) {
        // Art of Computer Programming vol. 2, Knuth, 4.2.2, (15)
        mean += (value - mean) / count;

        } else if (value instanceof Long || value instanceof Integer) {
            buf.append(((Number) value).longValue());
        } else if (value instanceof Number) {
            buf.append(((Number) value).doubleValue());
        } else {
            buf.append('"').append(StringEscapeUtils.escapeJson(value.toString())).append('"');
        }
        return buf;
    }

    /**

        // Double
        final Object doubleResult = groovyEngine.evaluate("return 3.14159", params);
        assertTrue(doubleResult instanceof Number);
        Assertions.assertEquals(3.14159, ((Number) doubleResult).doubleValue(), 0.00001);

        // Boolean
        assertEquals(true, groovyEngine.evaluate("return true", params));
        assertEquals(false, groovyEngine.evaluate("return false", params));

        // Null

    return longBitsToDouble(significand | ONE_BITS);
  }

  static double bigToDouble(BigInteger x) {
    // This is an extremely fast implementation of BigInteger.doubleValue(). JDK patch pending.
    BigInteger absX = x.abs();
    int exponent = absX.bitLength() - 1;
    // exponent == floor(log2(abs(x)))
    if (exponent < Long.SIZE - 1) {
      return x.longValue();

        final Object value = map.get(key);
        if (value == null) {
            return defaultValue;
        }
        if (value instanceof Number numValue) {
            return numValue.doubleValue();
        }
        return Double.parseDouble(value.toString());
    }

    /**
     * Gets a Boolean value from the map.
     *
     * @param map The source map

        new EntryTransformer<Number, Number, Double>() {
          @Override
          public Double transformEntry(Number key, Number value) {
            return key.doubleValue() + value.doubleValue();
          }
        };

    Map<Object, Double> objectKeyed;
    Map<Number, Double> numberKeyed;
    Map<Integer, Double> integerKeyed;