It uses a base class as that is the intended implementation from Attribute::Handlers. However, I could have made the attributes universal by stuffing them in the UNIVERSAL class, but that seemed like an abomination (even though many programmers are doing it -- I'm wondering if there is some benefit that I'm missing).

I had tried setting it up via exporting, but I couldn't get it to work. Probably just a screwup in my syntax somewhere.