지역 변수 빈 문자열이 0으로 잘못 변환되는 문제 수정 #3034
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지역 변수를 빈 문자열('')로 설정하면 getValue()는 0을 반환합니다.
는 1(문자열 "0"의 길이)이고,
는 false,
는 true를 반환합니다.
이로 인해서,
이 pr은 getValue이 값이 undefined가 아닐 때만 0을 반환하도록 수정합니다.