It seems that "Tels" has hijacked Set::String for the moment. Nope, I never gave it up. I tried emailing the guy, but he won't accept emails without jumping through some gpg hoops. I'm not going to jump through his hoops (especially since I don't have it on my windows box).
Instead I've applied for registration of Set::String, Set::Array, and Set::Hash. I also attempted to re-upload Set::String 0.03, but I'm not sure if it worked.