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Here are the documentation and test diffs.

I'm glad to hear of the positive feedback. I couldn't find
the csv mailing list (I assume it's not public), so didn't
see the discussion of round-tripping, but I agree with the
implied conclusion that flagging rows as comments would
complicate the interface too much.

On a related point, I noticed that the csv documentation is
filed under "Internet data handling". This seems a little
odd - I'd suggest moving it to "Miscellaneous Services"
alongside fileinput and ConfigParser.

Thanks,
Iain.