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I love the idea of the vanity URLs for user profiles, but I hate the idea that users could take any address on my site they want. What stops somebody from making their vanity URL "About" or something and then having something at example.com/about?
So, is there some way to force a prefix - so it could be example.com/users/bill-jones (or whatever)?
If not, that seems like a pretty critical bit of functionality.