If we're going to delve into detail, I would agree that you are right about the initial posting, though it might (or might not) have helped to explain why the cast was improper. But the follow up:

Is there some reason why you think the developers of Perl are wrong in providing the INT2PTR macro? Do you have some justification for not wanting to use it?

That is both confrontational and sarcastic, which is not a good strategy if you want to influence someone to do something. Now, as it happens, you're right as far as I can tell: in particular the argument that "you should not enable warnings until you really understand them" strikes me as a bit absurd. And furthermore, your correspondent falls into the rather frustrating pattern of throwing around terms like "logical fallacy" without apparently understanding what they mean. That said, he's the maintainer of the module and you're not, and as a result you're now stuck.