static ReliableSingleThread rstWithPreDelay_v2(int delay, Runnable r) {
  var rst = ReliableSingleThread(r);
  rst.preSleep = -> sleep(delay);
  ret rst;
}

static ReliableSingleThread rstWithPreDelay_v2(double seconds, Runnable r) {
  ret rstWithPreDelay_v2(toMS_int(seconds), r);
}