public function getByType($class)
    {
        $class = array_map('strtolower', (array)$class);

        $out = array_filter($this->_items, function ($assoc) use ($class) {
            list(, $name) = namespaceSplit(get_class($assoc));

            return in_array(strtolower($name), $class, true);
        });

        return array_values($out);
    }