s[0] = byte(id)
	s[1] = 0 // Reserved
	return s
}

func (s *subHandlerID) String() string {
	if s == nil {
		return ""
	}
	return hex.EncodeToString(s[:])
}

func makeZeroSubHandlerID(id HandlerID) subHandlerID {
	return subHandlerID{byte(id)}
}

type handlers struct {
	single    [handlerLast]SingleHandlerFn
	stateless [handlerLast]*StatelessHandler