/stats http handler is not concurrency-safe?

[cfergeau]

func (n *VirtualNetwork) Mux() http.Handler has:

mux.HandleFunc("/stats", func(w http.ResponseWriter, r *http.Request) {                                                          
	_ = json.NewEncoder(w).Encode(statsAsJSON(n.networkSwitch.Sent, n.networkSwitch.Received, n.stack.Stats()))
})

The Sent and Received variables are modified using atomic functions, but I suspect they need to read through similar APIs for something thread-safe?

n.stack.Stats() is:

// Stats returns a mutable copy of the current stats.
//      
// This is not generally exported via the public interface, but is available
// internally.
func (s *Stack) Stats() tcpip.Stats {
        return s.stats
}

This does not seem to be something which is intended to be accessed safely from multiple threads?