assertFalse(
          "Should not contain key " + entry.getKey() + " mapped to value " + entry.getValue(),
          equal(getMap().get(entry.getKey()), entry.getValue()));
    }
  }

  private static boolean equal(@Nullable Object a, @Nullable Object b) {
    return a == b || (a != null && a.equals(b));
  }

  // This one-liner saves us from some ugly casts
  protected Entry<K, V> entry(K key, V value) {

        // Support upgrades: 4.0.0 → 4.1.0, 4.0.0 → 4.2.0, 4.1.0 → 4.2.0
        if (MODEL_VERSION_4_0_0.equals(fromVersion)) {
            return MODEL_VERSION_4_1_0.equals(toVersion) || MODEL_VERSION_4_2_0.equals(toVersion);
        }
        if (MODEL_VERSION_4_1_0.equals(fromVersion)) {
            return MODEL_VERSION_4_2_0.equals(toVersion);
        }

        return false;
    }

    /**

    @SuppressWarnings("EqualsHashCode")
    @Override
    public boolean equals(@Nullable Object other) {
      return (other instanceof ClassWhichIsAlwaysEqualButHasDifferentHashcodes);
    }
  }

  private static class ObjectWhichIsEqualButChangesClass implements Serializable {
    private static final long serialVersionUID = 1L;

    @Override
    public boolean equals(@Nullable Object other) {

	for k, v := range m {
		switch {
		case equals(k, ReservedMetadataPrefixLower+ReplicationTimestamp):
			d.ReplicaTimeStamp, _ = amztime.ParseReplicationTS(v)
		case equals(k, ReservedMetadataPrefixLower+ReplicaTimestamp):
			d.ReplicaTimeStamp, _ = amztime.ParseReplicationTS(v)
		case equals(k, ReservedMetadataPrefixLower+ReplicaStatus):
			d.ReplicaStatus = replication.StatusType(v)
		case equals(k, ReservedMetadataPrefixLower+ReplicationStatus):

      } else {
        return false;
      }
    }

    private boolean equalsTypeVariable(TypeVariable<?> that) {
      return var.getGenericDeclaration().equals(that.getGenericDeclaration())
          && var.getName().equals(that.getName());
    }
  }

   * be declared as a {@code List}.
   *
   * <p>Note also that serialization is not in general required to return an object that is
   * {@linkplain Object#equals equal} to the original, nor is it required to return even an object
   * of the same class. For example, if sublists of {@code MyList} instances were serializable,

   *
   * <p>Two {@code ListMultimap} instances are equal if, for each key, they contain the same values
   * in the same order. If the value orderings disagree, the multimaps will not be considered equal.
   *
   * <p>An empty {@code ListMultimap} is equal to any other empty {@code Multimap}, including an
   * empty {@code SetMultimap}.
   */
  @Override
  boolean equals(@Nullable Object obj);

   *
   * <p>Two {@code ListMultimap} instances are equal if, for each key, they contain the same values
   * in the same order. If the value orderings disagree, the multimaps will not be considered equal.
   *
   * <p>An empty {@code ListMultimap} is equal to any other empty {@code Multimap}, including an
   * empty {@code SetMultimap}.
   */
  @Override
  boolean equals(@Nullable Object obj);

   *
   * <p>Two {@code ListMultimap} instances are equal if, for each key, they contain the same values
   * in the same order. If the value orderings disagree, the multimaps will not be considered equal.
   */
  @Override
  public boolean equals(@Nullable Object object) {
    return super.equals(object);
  }

    /**
     * Compares the specified object with this cell for equality. Two cells are equal when they have
     * equal row keys, column keys, and values.
     */
    @Override
    boolean equals(@Nullable Object obj);

    /**
     * Returns the hash code of this cell.
     *
     * <p>The hash code of a table cell is equal to {@link Objects#hashCode}{@code (e.getRowKey(),
     * e.getColumnKey(), e.getValue())}.