Pretty much the rfc. https://datatracker.ietf.org/doc/html/rfc4180 https://datatracker.ietf.org/doc/html/rfc4180 Parsers are trickier if you want to be lenient

Pretty much the rfc. https://datatracker.ietf.org/doc/html/rfc4180 https://datatracker.ietf.org/doc/html/rfc4180 Parsers are trickier if you want to be lenient, but exporters are dead simple.