console.log(`change: from ${from.id} to ${to.id} current ${from.via.get(to)!.id} metric ${from.route_quality(to,from.via.get(to)!).metric()} best ${best_route.id} metric ${from.route_quality(to,best_route).metric()}`);
console.log(`change: from ${from.id} to ${to.id} current ${from.via.get(to)!.id} metric ${from.route_quality(to,from.via.get(to)!).metric()} best ${best_route.id} metric ${from.route_quality(to,best_route).metric()}`);