It is used as setting information about whether to change the case of text like ColumnAutoFilter.displayCase.
| NORMAL | "normal" | Do not change. | 
| UPPER | "upper" | Change to uppercase. | 
| LOWER | "lower" | Change to lowercase. | 
    var col = grid.columnByName('Addr');
    col.setAutoFilter({
        displayCase: DataLudi.TextCase.UPPER
    });