The "problem" isn't specific to Moose. Perl itself provides even less.

Perl doesn't have an infatuation with enforced privacy. It would prefer that you stayed out of its living room because you weren't invited, not because it has a shotgun
— Larry Wall

Mind you, the internal setter in "conventional" objects is usually direct hash access rather than a method, but that's no more private that Moose's setters.

In reply to Re^7: Psychic Disconnect and Object Systems by ikegami
in thread Psychic Disconnect and Object Systems by John M. Dlugosz

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