Cool, I immediately wondered if you handled a lot of the tricky CSV things like quotes and internal commas, it looks like it does a good job.

Comparing against Numbers (probably a bad comparison?) I am seeing one slightly different result:

If I have a field that is "hehe"

It's encoded as ""hehe""

It looks like Numbers adds the enclosing quotes:

"""hehe"""

I only see enclosing quotes if there's a comma:

"hehe,hehe" -> """hehe,hehe"""

Anyhow, I'm not sure what the "correct" thing to do here is, if there is one, just a heads up!