public function stagesDiffer()
    {
        if (func_num_args() > 0) {
            Deprecation::notice('5.0', 'Versioned only has two stages and stagesDiffer no longer requires parameters');
        }
        $id = $this->owner->ID ?: $this->owner->OldID;
        if (!$id || !$this->hasStages()) {
            return false;
        }

        $draftVersion = static::get_versionnumber_by_stage($this->owner, Versioned::DRAFT, $id);
        $liveVersion = static::get_versionnumber_by_stage($this->owner, Versioned::LIVE, $id);
        return $draftVersion !== $liveVersion;
    }