val codePoints = mutableListOf<Int>()

    // consume all code points before the last delimiter (if there is one)
    //  and copy them to output, fail on any non-basic code point
    val lastDelimiter = string.lastIndexOf('-', limit)
    if (lastDelimiter >= pos) {
      while (pos < lastDelimiter) {
        when (val codePoint = string[pos++]) {
          in 'a'..'z', in 'A'..'Z', in '0'..'9', '-' -> {