We had a thread dealing with IO::Prompt just recently where I faced a similar problem. CPAN, and even Build.PL, doesn't really deal with version very well. In fact, I'd kind of argue that it's only bleeding-edge, not-for-production modules that should use version at this point.

The Want problem, however, has been fixed by the author, I'm assured. However, that would be version 0.99.3 or higher, whenever they decide to release it.