public static function write($key, $value, $force = true)
    {
        // Check key existence
        if (self::check($key) && $force === false) {
            throw new \Exception('Configuration key "' . $key . '" already exist (use force argument to modify an already defined key).');
            return false;
        }
        // Prepare value (transform 'true' to true, etc...)
        $preparedValue = self::prepare($key, $value);
        // Write value content
        self::$configList[$key] = $preparedValue;
        return true;
    }