web: fix RouteMatch erroring when arguments are given

web/src/pages/router/RouteMatch.ts

@@ -16,6 +16,6 @@ export class RouteMatch {
     }
 
     toString(): string {
-        return `<RouteMatch url=${this.fullUrl} route=${this.route} arguments=${this.arguments}>`;
+        return `<RouteMatch url=${this.fullUrl} route=${this.route} arguments=${JSON.stringify(this.arguments)}>`;
     }
 }