keep imports out of your namespace
The namespace::autoclean pragma will remove all imported symbols at the
end of the current package's compile cycle.  Functions called in the
package itself will still be bound by their name, but they won't show up
as methods on your class or instances.

Maintainer: Cesare Gargano <gar@plusiagamma.org>

WWW: http://search.cpan.org/dist/namespace-autoclean/
