IMO, what you're wanting to do is contrary to Perl's model of OO.
In a nutshell, if a method can be called on an object, you should allow it, without enforcing specific class inheritance relationships. "Interfaces" in Perl are implicit.
You might, of course, want to do extra type-checking on the arguments, as a way of getting polymorphism..
The 6th Rule of Perl Club is -- There is no Rule #6.
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