if (written > 0 && p[written-1] == '\0' && char_written == length) {
uint16_t last_char;
s->Write(&last_char, length - 1, 1, String::NO_HINTS);
s->Write(&last_char, length - 1, 1, String::NO_OPTIONS);
if (last_char != 0 || written > s->Utf8Length()) {
written--;
}
