Just a little UX note: I'm trying to register and I get a "Username is invalid" error. I have a special character in it ("-") so I guess that's why, but it woul

Just a little UX note: I'm trying to register and I get a "Username is invalid" error. I have a special character in it ("-") so I guess that's why, but it would be a good idea to state your validity rules in the error message.