docs: function (obj) {
        var loc = _emberMetalProperty_get.get(this, 'length') || 0;
        while (--loc >= 0) {
          var curObject = _emberRuntimeMixinsArray.objectAt(this, loc);
  
          if (curObject === obj) {
            this.removeAt(loc);
          }
        }
        return this;
      }