func (h *StreamTypeHandler[Payload, Req, Resp]) WithOutCapacity(out int) *StreamTypeHandler[Payload, Req, Resp] {
	h.OutCapacity = out
	return h
}

// WithInCapacity adjusts the input capacity from the handler perspective.
// This must be done prior to registering the handler.
func (h *StreamTypeHandler[Payload, Req, Resp]) WithInCapacity(in int) *StreamTypeHandler[Payload, Req, Resp] {
	h.InCapacity = in

Note that Responses sent for serialization are automatically reused for similar requests.
If the response contains shared data it will cause issues, since each unique response is reused.