Serhiy,  sorry I'm not sure I understand your question.  But if you take a look at the script that exhibits the problem I think the bug that I'm reporting becomes more clear.

Namely, using the dialect configuration shown in the script, the round trip conversion from string through writer then through the reader back to string is inconsistent.  The reader should return as output the same input that was given to the corresponding writer and this is not the case.  

So even if CVS in not well defined I believe the writer and reader should at least be consistent.