Today Perl 5.12.0 saw the light of the day. It includes some cool features. For example, to define package versions on the package keyword is great. But these new features (including in the same bag the new features from 5.10) make me discuss with myself about their use or not.

That is, I know several people that does not update their servers. They are in production for a long time, and they do not want to risk it all getting broken. This means they can't use recent module versions if they include new syntax improvements like the ones added in Perl 5.10 and 5.12. I, me, myself, have…