Method to_lower

library/cpp/containers/cow_string/cow_string.cpp:88–90

template <>
bool TBasicCowString<char, std::char_traits<char>>::to_lower(size_t pos, size_t n) {
    return Transform([](size_t, char c) { return AsciiToLower(c); }, pos, n);
}

template <>
bool TBasicCowString<char, std::char_traits<char>>::to_upper(size_t pos, size_t n) {