Yeah, I actually hadn't seen that, but I know there are also longstanding tickets for this. I actually don't like the solutions in those threads, I think better to just add an extra field to the models, so have something like 'db_email' and 'display_email'. I realize you can do this with a functional index or whatever, but I think that's actually kind of hacky given the lack of ORM support for functional indexes.

My big issue with the current state though is that if you're relying on usernames or email addresses being unique then you're potentially opening yourself up to all sorts of security issues without realizing it.