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You probably know it already, but in case not, the CSV format is not fully standardized, and so there are variations. So you might have to handle those to provide better support of the feature, if you implement it.

https://en.wikipedia.org/wiki/Comma-separated_values

For example, csv.reader in Python's csv module in the stdlib, has a dialect argument, due to this.

https://docs.python.org/2/library/csv.html

https://docs.python.org/3/library/csv.html

Perhaps deal with quotes strings generally, and then quoted strings mode with FS=, is CSV mode, and that quoted string functionality is available elsewhere (and maybe also for output).

Less intuitive maybe for beginners but more generally useful?

If you add a -csv I would use it!