code: func (p *peer) RequestCode(reqID, cost uint64, reqs []CodeReq) error {
  	p.Log().Debug("Fetching batch of codes", "count", len(reqs))
  	return sendRequest(p.rw, GetCodeMsg, reqID, cost, reqs)
  }
docs: // RequestCode fetches a batch of arbitrary data from a node's known state
  // data, corresponding to the specified hashes.