IMHO the point about .csv is that writing a parser is trivial so none of this matters. Many writers bork on certain types of data. No biggie. Yes there are variants, no they are not complicated. Trying to support _all_ variants of something that is not well-defined is a mugs game. Most of the differences are by mistake. Some of the differences can't be fixed in the parser.

If you need csv to work, pick any one interpretation that does work.