1. Either you want to edit the file in a text editor and you need to have a separator that has a key on your keyboard. Comma is indeed not the greatest choice, but tab or vertical pipe are usually fine. Most parsers will allow you to define the separator.

2. Or you don’t and you’re much better off with any binary format.

Why aren’t unicode separators keys on your keyboard? Maybe that’s suboptimal, but good luck changing that.