Intro Filtering requirements have grown. We need to be able to filter any kind of Persons. 필터링 요구사항이 늘었습니다. 이제 Person의 모든 종류를 구분해야합니다. Exercise Fix typing for the filterPersons so that it can filter users and return User[] when personType='user' and return Admin[] when personType='admin'. Also filterPersons should accept partial User/Admin type according to the personType. `criteria` argument sh..