The compiler disallowing them globally might count as that. But individual crates enforcing an "ascii only" policy makes sense, if they never plan to use non-as

The compiler disallowing them globally might count as that. But individual crates enforcing an "ascii only" policy makes sense, if they never plan to use non-ascii. Personally I'd prefer even one step further: the compiler would disallow them by default, and you can opt into specific character sets/languages at a crate level. e.g. `AllowSpecialCharacters("de")` to enable on special characters common in German.