protected function normalizeOptions(array $options, array $value)
    {
        return $options['select2']['enabled']
            ? array_merge($value, [
                'error_bubbling' => false,
                'multiple' => false,
                'select2' => array_merge($options['select2'], [
                    'tags' => $options['allow_add'],
                ]),
            ])
            : $value;
    }