docs: public BUILDER setFirstAvailableImageRequests(
        REQUEST[] firstAvailableImageRequests,
        boolean tryCacheOnlyFirst) {
      Preconditions.checkArgument(
          firstAvailableImageRequests == null || firstAvailableImageRequests.length > 0,
          "No requests specified!");
      mMultiImageRequests = firstAvailableImageRequests;
      mTryCacheOnlyFirst = tryCacheOnlyFirst;
      return getThis();
    }