[util.smartptr.weak.general] Clarify when a weak_ptr is empty#6991
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eisenwave wants to merge 1 commit intocplusplus:mainfrom
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[util.smartptr.weak.general] Clarify when a `weak_ptr` is empty#6991eisenwave wants to merge 1 commit intocplusplus:mainfrom
eisenwave wants to merge 1 commit intocplusplus:mainfrom