I said nothing about rights. I was talking about privileges and immunities. Did you miss that? Did you not understand that?
Article IV, Section 2 deals with privileges and immunities, not rights. I said when it comes to Article IV privileges and immunities, a state cannot treat a citizen of another state differently than their own.
So what was in the Constitution in 1787 to stop a state from denying fundamental rights to a citizen of another state, if not Article IV?