Fix template binding. Turns out that bindCallback by default traps excepions

pkg/template_binding/lib/src/node.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of template_binding;
 
 /** Extensions to the [Node] API. */
 class NodeBindExtension {
   final Node _node;
   final JsObject _js;
@@ skipping 139 matching lines @@
 
   deliver() => _js.callMethod('deliver');
 }
 
 /// Given a [bindable], create a JS object proxy for it.
 /// This is the inverse of [jsObjectToBindable].
 JsObject bindableToJsObject(Bindable bindable) {
   if (bindable is _JsBindable) return bindable._js;
 
   var zone = Zone.current;
-  inZone(f) => zone.bindCallback(f);
-  inZoneUnary(f) => zone.bindUnaryCallback(f);
+  inZone(f) => zone.bindCallback(f, runGuarded: false);
+  inZoneUnary(f) => zone.bindUnaryCallback(f, runGuarded: false);
 
   return new JsObject.jsify({
     'open': inZoneUnary(
         (callback) => bindable.open((x) => callback.apply([x]))),
     'close': inZone(() => bindable.close()),
     'discardChanges': inZone(() => bindable.value),
     'setValue': inZoneUnary((x) => bindable.value = x),
     // NOTE: this is not used by Node.bind, but it's used by Polymer:
     // https://github.com/Polymer/polymer-dev/blob/ba2b68fe5a5721f60b5994135f3270e63588809a/src/declaration/properties.js#L130
     // Technically this works because 'deliver' is on PathObserver and
@@ skipping 19 matching lines @@
    */
   Node get lastNode => _lastNode;
 
   /** The model used to instantiate the template. */
   final model;
 
   Node _firstNode, _lastNode;
 
   TemplateInstance(this.model);
 }