It'd help with the edge case I showed... "safe" is a strong word though, doesn't handle this one: std::string json() { return "\"123\""; } std::string_view

It'd help with the edge case I showed... "safe" is a strong word though, doesn't handle this one: std::string json() { return "\"123\""; } std::string_view unquote(std::string_view s) { return { s.data()+1, s.size()-2 }; } auto i = from_string(unquote(json())); It's a fundamental problem of subtly & unexpectedly deferred action.