public function saveEach(CollectionInterface $objItems, $timestamp = 0)
    {
        if (null === $timestamp) {
            // @codingStandardsIgnoreStart
            @\trigger_error(
                'Not passing a timestamp has been deprecated and will cause an error in MetaModels 3',
                E_USER_DEPRECATED
            );
            // @codingStandardsIgnoreEnd
        }

        foreach ($objItems as $objItem) {
            $this->save($objItem, $timestamp);
        }
    }