assertThat(UnsignedLongs.parseUnsignedLong("18446744073709551615"))
        .isEqualTo(0xffffffffffffffffL);
    assertThat(UnsignedLongs.parseUnsignedLong("9223372036854775807"))
        .isEqualTo(0x7fffffffffffffffL);
    assertThat(UnsignedLongs.parseUnsignedLong("18382112080831834642"))
        .isEqualTo(0xff1a618b7f65ea12L);
    assertThat(UnsignedLongs.parseUnsignedLong("6504067269626408013"))

    assertThat(UnsignedLongs.parseUnsignedLong("18446744073709551615"))
        .isEqualTo(0xffffffffffffffffL);
    assertThat(UnsignedLongs.parseUnsignedLong("9223372036854775807"))
        .isEqualTo(0x7fffffffffffffffL);
    assertThat(UnsignedLongs.parseUnsignedLong("18382112080831834642"))
        .isEqualTo(0xff1a618b7f65ea12L);
    assertThat(UnsignedLongs.parseUnsignedLong("6504067269626408013"))

    return tmp;
  }

  @Benchmark
  long parseUnsignedLong(int reps) {
    long tmp = 0;
    // Given that we make three calls per pass, we scale reps down in order
    // to do a comparable amount of work to other measurements.
    int scaledReps = reps / 3 + 1;
    for (int i = 0; i < scaledReps; i++) {
      int j = i & ARRAY_MASK;
      tmp += UnsignedLongs.parseUnsignedLong(decimalStrings[j]);

    return tmp;
  }

  @Benchmark
  long parseUnsignedLong(int reps) {
    long tmp = 0;
    // Given that we make three calls per pass, we scale reps down in order
    // to do a comparable amount of work to other measurements.
    int scaledReps = reps / 3 + 1;
    for (int i = 0; i < scaledReps; i++) {
      int j = i & ARRAY_MASK;
      tmp += UnsignedLongs.parseUnsignedLong(decimalStrings[j]);

   *
   * <p><b>Java 8+ users:</b> use {@link Long#parseUnsignedLong(String)} instead.
   *
   * @throws NumberFormatException if the string does not contain a valid unsigned {@code long}
   *     value
   * @throws NullPointerException if {@code string} is null (in contrast to {@link
   *     Long#parseLong(String)})
   */
  @CanIgnoreReturnValue
  public static long parseUnsignedLong(String string) {

   *     Character#MAX_RADIX}
   */
  @CanIgnoreReturnValue
  public static UnsignedLong valueOf(String string, int radix) {
    return fromLongBits(UnsignedLongs.parseUnsignedLong(string, radix));
  }

  /**
   * Returns the result of adding this and {@code val}. If the result would have more than 64 bits,
   * returns the low 64 bits of the result.
   *
   * @since 14.0
   */