I agree with some of this, and the author could've made a better case for from/to_chars: - Afaik stoi and friends depend on the locale, so it's not hard to bel

I agree with some of this, and the author could've made a better case for from/to_chars: - Afaik stoi and friends depend on the locale, so it's not hard to believe this introduced additional overhead. The implicit locale dependency is also often very surprising. - std::stoi only accepts std::string as input, so you're forced to allocate a string to use it. std::from_chars does not. - from/to_chars don't throw. As far as I know this won't affect performance if it doesn't happen, it does mean you can use these functions in environments where exceptions are disabled.