Subsequent decision not retroactively unsettling settlements

A subsequent decision of a higher court, in a different case, giving a different exposition to a point of law from the one declared and known, when a settlement between parties takes place, cannot have a retrospective effect, and overturn such settlement. The courts do not undertake to relieve parties from their acts and deeds fairly done, on a full knowledge of facts, though under a mistake of law. Every man is to be charged at his peril with a knowledge of the law.