panic(fmt.Sprintf("out of handler IDs. %d > %d", handlerLast, 255))
	}
}

func (h HandlerID) valid() bool {
	return h != handlerInvalid && h < handlerLast
}

func (h HandlerID) isTestHandler() bool {
	return h >= handlerTest && h <= handlerTest2
}

// RemoteErr is a remote error type.
// Any error seen on a remote will be returned like this.
type RemoteErr string