That's the conventional wisdom, but I'm not completely convinced that those are real problems. If you send someone a content-negotiated URL you can be pretty c

That's the conventional wisdom, but I'm not completely convinced that those are real problems. If you send someone a content-negotiated URL you can be pretty confident that they'll see the text/html (or application/xhtml+xml :-) version). Similarly, any typo report more specific than "there's a typo somewhere at this URL" will tell you what you need to know.