To avoid code duplication, several public methods have been removed from CSVWriter, e.g. all methods to append data to an existing file.
To do so, you can now use org.jamesii.core.util.misc.Files#appendToFiles, which can be easily combined with the CSVWriter, for example:
Files.appendToFile("my.csv", CSVWriter.toCSV(results, ',').toString());
Additionally, the (seemingly unused?) method to store 1D arrays has been removed. This avoids to accidentally pass a 2D primitive array into it, although it cannot handle it.
Also, note that only the fully-configurable CSVWriter#writeResult(...) method is now available for 2D arrays of the eight primitive data types, to avoid code duplication.