copyTo(prefix, 0, byteCount)
    for (i in 0 until 16) {
      if (prefix.exhausted()) {
        break
      }
      val codePoint = prefix.readUtf8CodePoint()
      if (Character.isISOControl(codePoint) && !Character.isWhitespace(codePoint)) {
        return false
      }
    }
    return true
  } catch (_: EOFException) {
    return false // Truncated UTF-8 sequence.
  }

        }
        // Iterate over unicode characters
        int offset = 0;
        while (offset < value.length()) {
            final int unicodeChar = value.codePointAt(offset);
            if (Character.isISOControl(unicodeChar)) {
                throw failure(String.format("%s cannot contain ISO control character '\\u%04x'.", name, unicodeChar));
            }
            if ('\\' == unicodeChar || ('/' == unicodeChar && !allowSlash)) {

            int symbolSize = 0;
            int c;
            final Set<String> termCache = new HashSet<>(1000);
            try {
                while ((c = reader.read()) != -1) {
                    if (Character.isISOControl(c) || isSpaceChar(c)) {
                        if (duplicateTermRemoved) {
                            if (alphanumSize > 0) {