if newResp == nil {
		panic("newResp missing in NewStream")
	}

	s := newStreamHandler[Payload, Req, Resp](h)
	if newReq != nil {
		s.reqPool.New = func() Req {
			return newReq()
		}
	} else {
		s.InCapacity = 0
	}
	s.respPool.New = func() Resp {
		return newResp()
	}