Class::Base => Badger::Base
I asked Andy Wardley if I could modernize the tests. He agreed, so after almost 10 years break and 20 minutes hacking, there is a new version of Class::Base on CPAN. He also suggested that people should rather use Badger::Base which is effectively its successor.
So now Class::Base recommends Badger::Base in its documentation.
If your module is using Class::Base you might want to consider switching.
Written by Gabor Szabo.