code: public static <T> T unmarshal(Entity nativeEntity, Class<T> entityClass) {
      return unmarshalBaseEntity(nativeEntity, entityClass);
    }
docs: Unmarshals the given native Entity into an object of given type, entityClass.
  
  @param <T>
  target object type
  @param nativeEntity
  the native Entity
  @param entityClass
  the target type
  @return Object that is equivalent to the given native entity. If the given
  <code>datastoreEntity</code> is <code>null</code>, returns <code>null</code>.