.that(Longs.tryParse(BigInteger.valueOf(MAX_VALUE).add(BigInteger.ONE).toString()))
        .isNull();
    assertWithMessage("Max long * 10")
        .that(Longs.tryParse(BigInteger.valueOf(MAX_VALUE).multiply(BigInteger.TEN).toString()))
        .isNull();
    assertWithMessage("Min long - 1")
        .that(Longs.tryParse(BigInteger.valueOf(MIN_VALUE).subtract(BigInteger.ONE).toString()))
        .isNull();

    return (double) ((value >>> 1) | (value & 1)) * 2.0;
  }

  /** Returns the value of this {@code UnsignedLong} as a {@link BigInteger}. */
  public BigInteger bigIntegerValue() {
    BigInteger bigInt = BigInteger.valueOf(value & UNSIGNED_MASK);
    if (value < 0) {
      bigInt = bigInt.setBit(Long.SIZE - 1);
    }
    return bigInt;
  }

  @Override

import static com.google.common.truth.Truth.assertThat;
import static java.math.BigInteger.ONE;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import com.google.common.collect.testing.Helpers;
import com.google.common.testing.NullPointerTester;
import java.math.BigInteger;
import java.util.Arrays;
import java.util.Comparator;

   */
  @Override
  public double doubleValue() {
    return longValue();
  }

  /** Returns the value of this {@code UnsignedInteger} as a {@link BigInteger}. */
  public BigInteger bigIntegerValue() {
    return BigInteger.valueOf(longValue());
  }

  /**
   * Compares this unsigned integer to another unsigned integer. Returns {@code 0} if they are

    long significand = doubleToRawLongBits(x) & SIGNIFICAND_MASK;
    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();

   * Returns the {@code Inet4Address} corresponding to a given {@code BigInteger}.
   *
   * @param address BigInteger representing the IPv4 address
   * @return Inet4Address representation of the given BigInteger
   * @throws IllegalArgumentException if the BigInteger is not between 0 and 2^32-1
   * @since 28.2
   */
  public static Inet4Address fromIPv4BigInteger(BigInteger address) {

import static com.google.common.truth.Truth.assertThat;
import static org.junit.Assert.assertThrows;

import java.lang.reflect.Method;
import java.math.BigInteger;
import junit.framework.TestCase;
import org.jspecify.annotations.NullUnmarked;

/**
 * Tests for {@link DoubleUtils}.
 *
 * @author Louis Wasserman
 */
@NullUnmarked

    return source.readByte().toInt() != 0
  }

  fun readBigInteger(): BigInteger {
    if (bytesLeft == 0L) throw ProtocolException("unexpected length: $bytesLeft at $this")
    val byteArray = source.readByteArray(bytesLeft)
    return BigInteger(byteArray)
  }

  fun readLong(): Long {

      tagClass = DerHeader.TAG_CLASS_UNIVERSAL,
      tag = 2L,
      codec =
        object : BasicDerAdapter.Codec<BigInteger> {
          override fun decode(reader: DerReader): BigInteger = reader.readBigInteger()

          override fun encode(
            writer: DerWriter,
            value: BigInteger,
          ) = writer.writeBigInteger(value)
        },
    )

  val BIT_STRING =
    BasicDerAdapter(

    fun serialNumber(serialNumber: BigInteger) =
      apply {
        this.serialNumber = serialNumber
      }

    /** Sets this certificate's serial number. If unset the serial number will be 1. */
    fun serialNumber(serialNumber: Long) =
      apply {
        serialNumber(BigInteger.valueOf(serialNumber))
      }

    /**