Class::data::inheritable is for creating accessors/mutators to class data. that is, if you want to store something about your class as a whole (instead of about a single object). this data is then inherited by your subclasses and can be overridden.

for example:

pere::ubu->mk_classdata('suitcase');

will generate the method suitcase() in the class pere::ubu.

this new method can be used to get and set a piece of class data.

pere::ubu->suitcase('red'); $suitcase = pere::ubu->suitcase;