INSTANCE;

    @Override
    public int compare(int[] left, int[] right) {
      int minLength = Math.min(left.length, right.length);
      for (int i = 0; i < minLength; i++) {
        if (left[i] != right[i]) {
          return UnsignedInts.compare(left[i], right[i]);
        }
      }
      return left.length - right.length;
    }

    @Override
    public String toString() {

    this.function = checkNotNull(function);
    this.ordering = checkNotNull(ordering);
  }

  @Override
  public int compare(@ParametricNullness F left, @ParametricNullness F right) {
    return ordering.compare(function.apply(left), function.apply(right));
  }

  @Override
  public boolean equals(@CheckForNull Object object) {
    if (object == this) {
      return true;
    }
    if (object instanceof ByFunctionOrdering) {

  }

  @Override
  public int compare(@ParametricNullness T left, @ParametricNullness T right) {
    for (int i = 0; i < comparators.length; i++) {
      int result = comparators[i].compare(left, right);
      if (result != 0) {
        return result;
      }
    }
    return 0;
  }

  @Override
  public boolean equals(@CheckForNull Object object) {

  }

  @Override
  public int compare(@ParametricNullness T left, @ParametricNullness T right) {
    for (int i = 0; i < comparators.length; i++) {
      int result = comparators[i].compare(left, right);
      if (result != 0) {
        return result;
      }
    }
    return 0;
  }

  @Override
  public boolean equals(@CheckForNull Object object) {

    INSTANCE;

    @Override
    public int compare(double[] left, double[] right) {
      int minLength = Math.min(left.length, right.length);
      for (int i = 0; i < minLength; i++) {
        int result = Double.compare(left[i], right[i]);
        if (result != 0) {
          return result;
        }
      }
      return left.length - right.length;
    }

    @Override
    public String toString() {

    }

    private void assertVersionOlder(String left, String right) {
        assertTrue(
                newArtifactVersion(left).compareTo(newArtifactVersion(right)) < 0,
                left + " should be older than " + right);
        assertTrue(
                newArtifactVersion(right).compareTo(newArtifactVersion(left)) > 0,
                right + " should be newer than " + left);
    }

    INSTANCE;

    @Override
    public int compare(int[] left, int[] right) {
      int minLength = Math.min(left.length, right.length);
      for (int i = 0; i < minLength; i++) {
        int result = Ints.compare(left[i], right[i]);
        if (result != 0) {
          return result;
        }
      }
      return left.length - right.length;
    }

    @Override
    public String toString() {

    Iterator<T> right = rightIterable.iterator();
    while (left.hasNext()) {
      if (!right.hasNext()) {
        return LEFT_IS_GREATER; // because it's longer
      }
      int result = elementOrder.compare(left.next(), right.next());
      if (result != 0) {
        return result;
      }
    }
    if (right.hasNext()) {
      return RIGHT_IS_GREATER; // because it's longer
    }

    INSTANCE;

    @Override
    public int compare(char[] left, char[] right) {
      int minLength = Math.min(left.length, right.length);
      for (int i = 0; i < minLength; i++) {
        int result = Chars.compare(left[i], right[i]);
        if (result != 0) {
          return result;
        }
      }
      return left.length - right.length;
    }

    @Override
    public String toString() {

    @Override
    public int compare(@CheckForNull Object left, @CheckForNull Object right) {
      if (left == right) {
        return 0;
      } else if (left == null) {
        return -1;
      } else if (right == null) {
        return 1;
      }
      int leftCode = identityHashCode(left);
      int rightCode = identityHashCode(right);
      if (leftCode != rightCode) {
        return leftCode < rightCode ? -1 : 1;