User blog comment:Rappy 4187/Technical Update: May 11, 2016/@comment-5288784-20160511202418

Let's assume two wikis are founded. One is English one addressed as frfoo.wikia.com, and the other is fr.foo.wikia.com. Wouldn't they have the same wgDBname? Would it create any potential problems outside the seemingly obvious case of global CSS affecting both wikis when it wasn't intended?