code: func MaxMsgSize(s int) server.Option {
  	return func(o *server.Options) {
  		if o.Context == nil {
  			o.Context = context.Background()
  		}
  		o.Context = context.WithValue(o.Context, maxMsgSizeKey{}, s)
  	}
  }
docs: //
  // MaxMsgSize set the maximum message in bytes the server can receive and
  // send.  Default maximum message size is 4 MB.
  //