Each attr can be accessed over $obj->{attr} or $obj->set_attr() and $obj->get_attr. And each key is tied to paste over the getter and setter methods too.

About the source filtering, Class::HPLOO can generate .pm files from .hploo files automatically in your distributions, if you don't want to parse the source for each interpreter execution or make distributions. But I can work in something that enables the interface with HDB::Object without need to use Class::HPLOO source filtering.