I am writing a heavy edit to my own question, Do players know that Wizards don't wear armour? .
ShadowKras mentioned the ability to make a knowledge check to determine class features and abilities. If I had known of this, I would have asked a very different question.
But now that I have this information, and am making a large edit to make the question less terrible, should I:
1) Ask a question that implies I don't know of the feature, and therefore make the answer valid?
2) Ask a question that includes that knowledge, and therefore makes the actually helpful answer invalid?
3) Just... abandon the bad question and ask a new one? (this doesn't seem very ethical, but the easiest solution on a purely personal level)