The characters would likely be unique, maybe even by the spec. Even if you wanted them, we use backslashes to escape strings in most common programming languag

The characters would likely be unique, maybe even by the spec. Even if you wanted them, we use backslashes to escape strings in most common programming languages just fine, the problem CSV is that commas aren't easy to recognize because they might be within a single or double quote string, or might just be a separator. Can strings in CSV have newlines? I bet parsers disagree since there's no spec really.