That's an interesting example. I think one thing to keep in mind is that meta-disagreements and disagreements are not the same thing, although they may appear

That's an interesting example. I think one thing to keep in mind is that meta-disagreements and disagreements are not the same thing, although they may appear the same. Are you certain this person is saying the function doesn't work the way the documentation says? Or, are they rather being forceful in arguing that the bug is in the function, not in their code, because it behaves in a way they see as being wrong? Those are two different disagreements, but my appear to be the same to outside observers. Obviously neither myself nor the parent you were replying to are the person you had the disagreement with, so we cannot tell you what was in their mind.