code: func WithTCPKeepAliveTimeout(t time.Duration) Option {
  	return func(c *config) {
  		c.tcpKeepAliveTimeout = t
  	}
  }
docs: // WithTCPKeepAliveTimeout sets the keep-alive period for an active TCP
  // connection.
  //
  // A setting of 0 disables TCP keep-alives.