code: function (object, property, id) {
    this.subscription.subscribe(object, property, id);
    return this._get(object, property);
  }
docs: Get a property from an object. Passes in the object id (depth) to make it
  much faster to do comparisons between new and old subscriptions.
  
  @param  {Object} object
  @param  {String} property
  @param  {String} id
  @return {*}