There are so-called affirmative defenses along these lines, like equitable estoppel, but the thing about affirmative defenses is that you don’t really get to wi

There are so-called affirmative defenses along these lines, like equitable estoppel, but the thing about affirmative defenses is that you don’t really get to wield them until you’re damn near trial, which means they don’t save you much money even if they work.