type Houses = {
	[HogwartsHouse.Gryffindor]: Gryffindor;
	[HogwartsHouse.Hufflepuff]: Hufflepuff;
	[HogwartsHouse.Ravenclaw]: Ravenclaw;
	[HogwartsHouse.Slytherin]: Slytherin;
};

function isInHouse<T extends HogwartsHouse>(
	person: Person,
	house: T,
): person is Houses[T] {
	return isWizard(person) && person.house === house;
}

function getPeopleLoyalTo(person: Person) {
	if (!isInHouse(person, HogwartsHouse.Gryffindor)) {
		return false;
	}
	return person.peopleLoyalTo;
}