Backbone - Relational Nested Broken with KeySources

HTML

<script src="http://documentcloud.github.com/underscore/underscore-min.js"></script>
<script src="http://documentcloud.github.com/backbone/backbone-min.js"></script>
<script src="https://raw.github.com/gist/1506758/091d7f3680489ecb8b511e196edcfc2e52dd05c6/backbone-localstorage.js"></script>
<script src="https://raw.github.com/PaulUithol/Backbone-relational/master/backbone-relational.js"></script>

JavaScript

var User = Backbone.RelationalModel.extend({

    urlRoot: ' ',

    sync: function (method, model, options) {
        options.success({
            id: 1,
            name: 'barUser'
        });
    }

});

var Task = Backbone.RelationalModel.extend({
    urlRoot: ' ',
    
    relations: [
        {
            type: Backbone.HasOne,
            key: 'creator',
            relatedModel: User,
            keySource: 'creator_id'
        }
    ],
    
    unset: function(attr, options) {
      if (attr == 'creator_id') {return false}
      (options || (options = {})).unset = true;
      return this.set(attr, null, options);
    },
    
    sync: function (method, model, options) {
        options.success({
            id: 1,
            name: 'barTask',
            creator_id: 1
        });
    }
});

var Tasks = Backbone.Collection.extend({
    
    model: Task,
    
    sync: function (method, model, options) {
        options.success([
            {
                id: 2,
                name: 'barTask1',
                creator_id: 1
            },
            {
                id: 3,
                name: 'barTask2',
                creator_id: 1
            }
        ]);
    }
});

var user = new User(),
    task = new Task(),
    tasks = new Tasks();

user.fetch();
task.fetch();
tasks.fetch();


console.log(user.attributes, task.attributes, tasks.models);