Full compile-time printf without Unicode bloat.
This is portable to any compiler that supports the C++20 standard or greater and is always a hard error, as it should be. It doesn't depend on an LSP or external lint tool. If your IDE/LSP can evaluate templates and macros, this will work in the editor, too.
Maybe? It's the first "real" C++ library I've made and for 99% of cases you should probably use libfmt. I made it because binary bloat with libfmt and std::format were greater than my tolerance. With printfˣ, you get nothing but a call to the system's printf (or equivalents). No Unicode tables, no plethora of error strings.