code: func (z AckResp) MarshalMsg(b []byte) (o []byte, err error) {
  	o = msgp.Require(b, z.Msgsize())
  	// map header, size 1
  	// string "ack"
  	o = append(o, 0x81, 0xa3, 0x61, 0x63, 0x6b)
  	o = msgp.AppendString(o, z.Ack)
  	return
  }
docs: // MarshalMsg implements msgp.Marshaler