code: @Override
    public Double add22(Double arg1, Double arg2) {
      if (arg1 == null || arg2 == null) {
        return Double.NaN;
      } else {
        return arg1 + arg2;
      }
    }
docs: /*
  (non-Javadoc)
  
  @see
  mtas.codec.util.DataCollector.MtasDataOperations#add22(java.lang.Number,
  java.lang.Number)