Currently if two rules appear in two different rule units with the same package name the rule names will clash, because processing is still on a package-name basis.

This is a bug: rules belonging to 2 different rule units should not clash, even if the rule units belong to the same package, because those rules would be namespaced by the entire rule identifier i.e. package + rule unit name (i.e. FQCN of the RuleUnitData class)