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refactor: CWG2518適用を前提として記述する
ref
- https://github.com/cpprefjp/site/commit/79fc60a46544883f2f132639a33ff68adb99e3d4#r139029850
- https://github.com/cpprefjp/site/issues/1257#issuecomment-1964098638
close #1257