Duplicate pages with member pages

I'm not sure if this was by design or not, but if you have your member profile pages set to username-userid.html or similar you can enter anything you like in the username part of the url and it will still display the same profile page.

e.g.

bob-1.html
frank-1.html

both show the same profile page.

Could you do a lookup to see if the username part is what's expected and then 301 to what it's meant to be?

e.g.

frank-1.html -> 301 -> bob-1.html

Thanks

Thank you for suggestion!