public function loadData(string $section, string &$filename = null)
    {
        $filename = $this->getFilename($section);

        if (!file_exists($filename)) {
            return null;
        }

        try {
            return include($filename);
        } catch (\Throwable $e) {
            return null;
        }
    }
public function loadData(string $section, string &$filename = null)
    {
        $filename = $this->getFilename($section);

        if (!file_exists($filename)) {
            return null;
        }

        try {
            return include($filename);
        } catch (\Throwable $e) {
            return null;
        }
    }
{@inheritdoc}

@param string $filename Cache filename.