I asked a question ("Meaning of acronym SSO"), which was "closed as exact duplicate" as another ("How is std::string implemented?"). But the close requests triggered a discussion, in the comments, about whether the question really was a duplicate. Several of the commentators have high SO reputation, suggesting the duplication is of a kind for which the policy is unclear.
Questions have been asked before about what constitutes a duplicate, but what was interesting (well, I thought so) about this duplicate was that my question was narrow in scope, and the question it was closed as a duplicate of was broad in scope. An answer to my question was buried in the answers of the original question, but not at all easy to find.
Does the policy about duplicates need clarification about "broad" and "narrow" questions?