static TailFile tailFileLinewisePlusLastLine(File file, int interval, VF1<S> onData) {
  ret tailFilePlusLastLine(file, interval,
    vfAppendToLineBuffer(new LineBuffer(onData)));
}

static TailFile tailFileLinewisePlusLastLine(File file, int interval, IVF1<S> onData) {
  ret tailFileLinewisePlusLastLine(file, interval, toVF1(onData));
}