public function getOriginal($entity)
    {
        /** @var Entity\Taxonomy $existing */
        foreach ($this as $k => $existing) {
            if (
                $existing->getContentId() === $entity->getContentId() &&
                $existing->getTaxonomytype() === $entity->getTaxonomytype() &&
                $existing->getSlug() === $entity->getSlug()
            ) {
                return $existing;
            }
        }

        return $entity;
    }