code: func (w *Worker) LoadRef(id string, hidden bool) (cache.ImmutableRef, error) {
  	var opts []cache.RefOption
  	if hidden {
  		opts = append(opts, cache.NoUpdateLastUsed)
  	}
  	return w.CacheManager.Get(context.TODO(), id, opts...)
  }
docs: // LoadRef loads a reference by ID