*       </ul>
   *   <li>If there is no non-private constructor or non-private static factory method declared by
   *       {@code cls}, instance methods are skipped for nulls test.
   *   <li>Nulls test is not performed on method return values unless the method is a non-private
   *       static factory method whose return type is {@code cls} or {@code cls}'s subtype.
   * </ul>
   */

   *       </ul>
   *   <li>If there is no non-private constructor or non-private static factory method declared by
   *       {@code cls}, instance methods are skipped for nulls test.
   *   <li>Nulls test is not performed on method return values unless the method is a non-private
   *       static factory method whose return type is {@code cls} or {@code cls}'s subtype.
   * </ul>
   */