Method operator<

extlibs/fmt/include/fmt/core.h:424–426

    return lhs.compare(rhs) != 0;
  }
  friend bool operator<(basic_string_view lhs, basic_string_view rhs) {
    return lhs.compare(rhs) < 0;
  }
  friend bool operator<=(basic_string_view lhs, basic_string_view rhs) {
    return lhs.compare(rhs) <= 0;
  }