update

dist/bundle.js

@@ -35543,9 +35543,7 @@ function _classCallCheck(instance, Constructor) { if (!(instance instanceof Cons
         if (typeof cb === 'string') {
             cb = vm[cb];
         }
-        return watch(vm.model, keyOrFn, _.bind(cb, vm.$$model ? vm.model : vm), _.extend({
+        return watch(vm.model, keyOrFn, _.bind(cb, vm.$$model ? vm.model : vm), options);
-            sync: true
-        }, options));
     }
 
     function initMethods(vm, methods) {

dist/fix/fix.js

@@ -1148,9 +1148,7 @@ function _classCallCheck(instance, Constructor) { if (!(instance instanceof Cons
         if (typeof cb === 'string') {
             cb = vm[cb];
         }
-        return watch(vm.model, keyOrFn, _.bind(cb, vm.$$model ? vm.model : vm), _.extend({
+        return watch(vm.model, keyOrFn, _.bind(cb, vm.$$model ? vm.model : vm), options);
-            sync: true
-        }, options));
     }
 
     function initMethods(vm, methods) {