public function get($key, $default = null)
    {
        if ($value = $this->getEnv($key)) {
            return $value;
        }

        $key = strtolower(str_replace('_', '-', $key));

        if (strpos($key, 'bolt-') !== 0) {
            $key = 'bolt-' . $key;
        }

        return isset($this->composerExtra[$key]) ? $this->composerExtra[$key] : $default;
    }