At least in respect towards interoperability, Moose-based objects are less problematic than inside-out objects.
That statement surprises me. Classes implemented as inside out object do not enforce any restrictions on classes that inherit from them, and they can inherit from any class, regardless of how it's implemented.

In reply to Re^2: Prevent direct acces to object's attributes by JavaFan
in thread Prevent direct acces to object's attributes by vitoco

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