* #entriesOnlyOnLeft()}, {@link #entriesOnlyOnRight()}, {@link #entriesInCommon()} and {@link
   * #entriesDiffering()} of the two instances are equal.
   */
  @Override
  boolean equals(@CheckForNull Object object);

  /**
   * Returns the hash code for this instance. This is defined as the hash code of
   *
   * <pre>{@code
   * Arrays.asList(entriesOnlyOnLeft(), entriesOnlyOnRight(),