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static S renderElapsedTimePleasantly(long ms default lastTiming()) {
  double secs = toSeconds(ms);
  if (secs >= 1) ret formatDouble(secs, 3) + " s";
  ret ms + " ms";
}

sS renderElapsedTimePleasantly(Runnable r) {
  long time = sysNow();
  r?.run();
  ret renderElapsedTimePleasantly(sysNow()-time);
}