protected function _unsetMany($keys)
    {
        $keys  = $this->_normalizeIterable($keys);
        $store = $this->_getDataStore();

        try {
            $this->_containerUnsetMany($store, $keys);
        } catch (InvalidArgumentException $e) {
            throw $this->_createOutOfRangeException($this->__('Invalid store'), null, $e, $store);
        }
    }