.. versionadded:: 1.3.0

def to_primitive(self, context=None):
        """
        .. versionadded:: 1.3.0
        """
        primitive = super(VerboseMixin, self).to_primitive(context)
        to_text = lambda x: six.text_type(x) if x is not None else x
        primitive.update({
            'verbose_name': to_text(self.verbose_name),
            'help_text': to_text(self.help_text),
        })
        return primitive