static CloseableCharSequence iso8859_readOnlyFileAsCharSequence(File f) {
  int l = toInt_safe(l(f));
  RandomAccessFile raf = randomAccessFileForReading(f);
  ret new CloseableCharSequence {
    public int length() { ret l; }
    public char charAt(int i) ctex { raf.seek(i); ret (char) raf.readByte(); }
    public CharSequence subSequence(int from, int to) { ret substringObject(this, from, to); }
    toString { ret charSequenceToStringByChar(this); }
    public void close { _close(raf); }
  };
}