async-exit-hook

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The runHook method has no error handling:

if (err) {
  // Pass error, calling uncaught exception handlers
  return hook(err, stepTowardExit);
}
return hook(stepTowardExit);

If a hook throws, then the exit procedure stops and exit is never actually achieved. (I found this by hitting #9 which threw in an exit routine.)

This could be fixed by wrapping in a try/catch and calling stepTowardsExit on error.