CSVFileLoader can no longer handle CSV files with spaces

With 3-7-7, CSVFileLoader could load CSV files with spaces in the data.

It appears that with 3-7-9 this is no longer the case. I believe it is because it delegates to ARFFFileLoader, but does not surround values containing spaces with quotes, as the ARFF syntax requires.

Would it be possible to change 3-7-9 CSVFileLoader to do so? This represents a fairly serious regression for us.

Thanks.