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Nested Optionals, Expected and Composition
https://www.foonathan.net/2018/12/nested-optionals-expected/
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`std::optional` means a `T` which might not be there. `std::optional>` means a `std::optional` which might not be there, so a `T` which might not be there, which might not be there. Is that the same as `std::optional` or something different?
