static TailFile watchQuotedLog_fromStart(File f, int interval, final VF1<S> onLine) {
  final LineBuffer buf = new(voidfunc(S line) {
    if (isQuoted(line))
      pcallF(onLine, unquote(line));
  });
  ret tailFile(f, interval, voidfunc(S s) { buf.append(s) });
}