public function __call($name, array $args)
 {
     // Overcomes a naming collision with `AwsClient::getConfig`.
     if (lcfirst($name) === 'getConfigFiles') {
         $name = 'GetConfig';
     } elseif (lcfirst($name) === 'getConfigFilesAsync') {
         $name = 'GetConfigAsync';
     }
     return parent::__call($name, $args);
 }