aaron.ballman added a comment. I'm wondering whether this should even warn pedantically. There are no format specifiers that apply directly to a `_Bool` datatype, so the user is left making a choice as to what specifier fits best. I think `hhd` and `hhu` are both equally reasonable types, as are the `d` and `u` groups directly -- I don't think we should warn on either of those specifiers with a `_Bool` argument. I could maybe see a case for pedantically diagnosing `h`, `l`, and `ll` prefixes with `_Bool` because that seems a bit type-confused to me. `c` as a specifier seems weird (given that false values will potentially terminate the string suddenly depending on terminal behavior, IIRC), but `lc` seems like type confusion again.
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