let EncoderResult::Unmappable(c) = encoder
.encode_from_utf8_to_vec_without_replacement(s, &mut buf, true)
.0
else {
unreachable!();
};
let EncoderResult::Unmappable(c) = encoder
.encode_from_utf8_to_vec_without_replacement(s, &mut buf, true)
.0
else {
unreachable!();
};