Epoxy 0 value not initialized

HTML

<script src="//cdnjs.cloudflare.com/ajax/libs/underscore.js/1.5.2/underscore-min.js"></script>
<script src="http://cdnjs.cloudflare.com/ajax/libs/backbone.js/1.1.0/backbone-min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/backbone.epoxy/1.3.1/backbone.epoxy.js"></script>
https://codepen.io/anon/pen/aYMxJM
<div id="test">

  
</div>

JavaScript

Backbone.Epoxy.binding.addFilter("isSelected", function(value, selected) {
	//console.log(value);
  //console.log(options);
  //console.log(_.indexOf(options, value) > -1);
    //return value == selected;
    return _.indexOf(selected, value) > -1;
});

var BindingView = Backbone.Epoxy.View.extend({
  el: '#test',
  template: _.template(`
     <label class="bookedup-element-label" data-bind="toggle:label,attr:{for:id}">
				<%= label %><span data-bind="toggle:required" class="bookedup-element-required">*</span>
		</label>
		
    <input type="radio" data-bind="checked:value" value="foo" /> Foo
    <input type="radio" data-bind="checked:value" value="bar"/> Bar
    <input type="radio" data-bind="checked:value" value="baz"/> Baz


	`),
  render() {
  	var json = this.model.toJSON();
    $(this.el).html(this.template(json));
    return this;
  }
});

var model = new Backbone.Model({
  id:'123',
  label:'Name:',
  firstName: 'Darth',
  lastName: 'Vader',
  required:true,
  linkText:"use Epoxy for data binding in Backbone", 
  linkUrl:"http://epoxyjs.org/",
	options: [
				{value: "a", label: "Foo"},
				{value: "b", label: "Bar"},
				{value: "c", label: "Baz"}
			],
  value: 'bar',
  errors: [
  	"Hello",
    "World"
  ]
});

var inst = new BindingView({model: model});
inst.render();
inst.applyBindings();


setTimeout(function(){
model.set('value', 'baz');
model.set('firstName', 'Jeff');
}, 1000)