CIRCLE WITH A DOT

@malwareminigun @thephd IIRC google saw advantage from string_view over std::string const&.

And it's not like they don't like their bounds check, they want to change the layout of std::vector in libc++ to be T* + 2x size_t, because it makes `size()` calls faster, and they do bounds checking on every `operator[]` call.

@malwareminigun That needs more context, it might just as well be improvement from using optional<T&>