static CharSequence iso8859_readOnlyFileAsCharSequence(File f) {
  int l = toInt_safe(l(f));
  temp RandomAccessFile raf = randomAccessFileForReading(f);
  ret new CharSequence {
    public int length() { ret l; }
    public char charAt(int i) ctex { raf.seek(i); ret (char) raf.readByte(); }
    public CharSequence subSequence() { fail("todo"); }
  };
}