improve error handling and logging

dist/static/assets/webcam.js

@@ -458,16 +458,18 @@ if (event.reason && event.reason.message && event.reason.stack){
 (function(){
     const oldLog = console.log;
     console.log = function () {
+        oldLog.apply(console, arguments);
+
         const err = new Error();
         const logSrc = err.stack.split("\n")[1];
+        const args = arguments.map((a) => ""+a); // to string
         window.parent.postMessage([{
         log: [{
             method: 'log',
-            data: arguments,
+            data: args,
             id: Date.now().toString()
         }],
         source: logSrc
         }], '*');
-        oldLog.apply(console, arguments);
     };
 })();