\u27[I]ndefiniteness\u27 is not a quantitative concept. The void for vagueness doctrine is traditionally understood as concerned with the capacity of legal rules to control conduct. The doctrine underwrites the clarity of the law\u27s distinction between acceptable and forbidden behavior, so as both to guide the actions of citizens and to restrict the discretion of government officials. In the words of a recent Supreme Court decision, the doctrine, [a]s generally stated .... requires that a penal statute define the criminal offense with sufficient definiteness that ordinary people can understand what conduct is prohibited and in a manner that does not encourage arbitrary and discriminatory enforcement. The traditional account of void for...