code: func New() *Client {
  	return &Client{
  		Concurrency:    DefaultClient.Concurrency,
  		MaxRetries:     DefaultClient.MaxRetries,
  		Backoff:        DefaultClient.Backoff,
  		ErrLog:         DefaultClient.ErrLog,
  		wg:             &sync.WaitGroup{},
  		RetryOnHTTP429: false,
  	}
  }
docs: // New constructs a new DefaultClient with sensible default values