code: func (b GUE) Encode(i *GUEFields) {
  	ctl := uint8(0)
  	if i.Control {
  		ctl = 1 << 5
  	}
  	b[typeHLen] = ctl | i.Type<<6 | (i.HeaderLength-4)/4
  	b[encapProto] = i.Protocol
  }
docs: // Encode encodes all the fields of the GUE header.