Well, JSesh doesn't handle latin text in columns very well (but, on the other hand, good handling would require significant extensions to the Manuel, as, for instance, rotated text. This being said, there is something which is definitly a bug and not a lack of feature:
If you enter the following,...
When a line number contains a '-' , for instance "3-4" JSesh currently produces the following code: |3-4-... which is wrongly interpreted when the text is reread.
Hence, we need to produce some non-standard code, like |3-4- ... and read it.