rance Co. of Am., 448 F.3d 693, 699 n.2 (4th Cir. 2006). As a rule that "all the federal courts of appeals employ," waiver "makes excellent sense." Joseph v. United States, 135 S. Ct. 705, 705, 190 L. Ed. 2d 461 (2014) (Kagan, J., respecting denial of certiorari). In past cases, we have endeavored to apply our waiver