code: function(){
      if(this.cache === NIL){ return void 0; }
      this.cache = NIL;
      for (var i = 0, l = this.subscribers.length; i < l; i++) {
        this.subscribers[i].isLazyValue && this.subscribers[i].makeDirty();
      }
    }
docs: Mark this LazyValue, and all who depend on it, as dirty by setting its cache to NIL. This will force a full re-compute of its value when next requests rather than just returning the cache object.