docs: protected void checkInputSize(List<Object> input) throws TransformationOperationException {
          int inputCount = getOperationInputCount();
          int inputSize = input.size();
          if (inputCount == -2) {
              return;
          } else if (inputCount == -1 && input.size() < 1) {
              throw new TransformationOperationException("There must be at least one input value.");
          } else if (inputCount != -1 && inputSize != inputCount) {
              throw new TransformationOperationException(
                  "The input values are not matching with the operation input count.");
          }
      }