Make usernames case insensitive

[stevenleeg]

It's possible to create usernames with the same name but different cases, which is a problem. Make usernames case insensitive when registering, checking, and logging in.

[cwaldren]

So is testUsername going to be different, or the same as testusername or TeStUsErNaMe?

[stevenleeg]

I believe it will see them as two separate usernames and allow them to coexist.

[ocrumbs]

Before authentication, force the input to lowercase strings.ToLower("MyUsername"). And always store the username in original format (i.e. the one provided by the user). Additionally/Optionally store key value set of both (lowercase version and original)