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left 또는 right 가 null? 일 경우 ::null 반환 => 실패
프로덕션에 ::null 이 문자열 값으로 노출되는 버그 발생
left 가 nil 이면 right, right 가 nil 이면 left (시도 중)
https://github.com/green-labs/lacinia/pull/11/files#r1658491242
테스트 통과함. 프로덕션 확인 필요