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vi21maobk9vp comments on Second-Order Logic: The Controversy - Less Wrong
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Suggestion: if your goal is AI, maybe abandon logic and set theory in favor of type theory. It seems better suited to computers anyway thanks to computational trinitarianism. The problem of pinning down models uniquely seems to be solved by something called the univalence axiom, which I currently don't understand at all.
I guess that understanding univalence axiom would be helped by understanding the implicit equality axioms.
Univalence axiom states that two isomorphic types are equal; this means that if type A is isomorphic to type B, and type C contains A, C has to contain B (and a few similar requirements).
Requiring that two types are equal if they are isomorphic means prohibiting anything that we can write to distinguish them (i.e. not to handle them equivalently).