I think you misunderstood my point (or exaggerated it a bit to make that reference). Regardless, Let me add my suggestion for those wanting to use std::optional

I think you misunderstood my point (or exaggerated it a bit to make that reference). Regardless, Let me add my suggestion for those wanting to use std::optional<bool>: If a developer wants a yes/no/unknown type, an enum class is better suited for the job. This forces them to explicitly compare values instead of relying on an implicit boolean conversion.