docs: @Nullable
    public synchronized List<ProducerContextCallbacks> setIsIntermediateResultExpectedNoCallbacks(
        boolean isIntermediateResultExpected) {
      if (isIntermediateResultExpected == mIsIntermediateResultExpected) {
        return null;
      }
      mIsIntermediateResultExpected = isIntermediateResultExpected;
      return new ArrayList<>(mCallbacks);
    }