RFC 4180 says it "documents the format that seems to be followed by most implementations" and in practice I find that to be true, though my CSVs don't interact

RFC 4180 says it "documents the format that seems to be followed by most implementations" and in practice I find that to be true, though my CSVs don't interact with a lot of very old software. You get very far by treating "RFC 4180, UTF-8" as a standard and considering every implementation that doesn't follow it to be broken. I'm not sure I have ever seen software that simultaneousy doesn't follow the RFC, but does consistently support escaping.