<code>NSError</code> object.</li>
      <li>Primitives are not supported as properties for entities. When
      generating your <code>NSManagedObject</code> subclasses, make sure this
      option is not enabled.</li>
      <li>For properties that are mapped to hash keys for the entities, only
    string and numeric (Integer 16/32/64, Decimal, Double, and Float) types are supported.</li>
      <li>For all other properties, it is possible to use Date and
    Boolean types as well as the already mentio