User-Panel Subdomain Uppercase vs lowercase

Has anyone experienced an issue with creating a subdomain with using an uppercase subdomain vs lowercase on: CWPpro version: 0.9.8.899

If you use an uppercase subdomain an error occurs but with a lowercase subdomain it proceeds to create the subdomain.

Thanks

 Is that bad?

WWW.domain.com isn't exactly normal.

Also, if I remember correctly, email ignores capitals.