rust-csv

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Internally-tagged enums are extremely useful and therefore used quite a lot in the wild. It's a bit of a shock to users to learn (the hard way) that they're not supported by csv. So it'd be great to at least document this limitation in the docs.

@BurntSushi could you please have a look?

@BurntSushi Given that you explicitly asked me for this PR and it's a simple change that will likely help a lot of people avoid bumping into the serious and unexpected limitation, ignoring it for years, is very disrespectful to say the least. 😔