Case-sensitive validations for the existing username and email address

[Michael-Liendo]

I think it would be good to be able to put the user name in upper or lower case, but without another one with the same name.

At the moment you can create a user in this way:

• "michael"
• "Michael"
• "michaEL".

And they would be for completely different users.

What I mean is that the user name would appear as an example:

• "Michael"

but without being able to create another user with the same characters