Use std::visit to exhaust std::variant possibilities.#30773
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QuLogic
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IIRC, the reason for the std::get_if with an else instead of a plain std::get was that some old macOS deployment target didn't have the implementation. Since cibuildwheel appears okay with this build, I think this should be okay for us and looks clearer, for the most part.
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This makes it unnecessary to silence impossible "unhandled" cases. See #30607 (comment).
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