code: func (c *RPCClient) respondSeq(seq uint64, respHeader *responseHeader) {
  	c.dispatchLock.Lock()
  	seqL, ok := c.dispatch[seq]
  	c.dispatchLock.Unlock()
  
  	// Get a registered listener, ignore if none
  	if ok {
  		seqL.Handle(respHeader)
  	}
  }
docs: // respondSeq is used to respond to a given sequence number