code: public S isNotInstanceOf(Class<?> type) {
      objects.assertIsNotInstanceOf(description, actual, type);
      return myself;
    }
docs: Verifies that the <em>actual</em> value is not an instance of the given type.
  
  @param type the type to check the <em>actual</em> value against.
  @return this assertion object.
  @throws NullPointerException if the given type is {@code null}.
  @throws AssertionError if the <em>actual</em> value is an instance of the given type.