Calling exit() in a uloop callback ends the loop and terminates the script
   with the given code, also when an exception guard is set. The guard does not
   receive the exit request.
   
   -- Testcase --
   {%
           import * as uloop from 'uloop';
   
           uloop.init();
  
          uloop.guard((e) => print(`guard: ${e.type}\n`));
  
          uloop.timer(10, () => exit(4));
          uloop.timer(100, () => {
                  print("loop kept running\n");
                  uloop.end();
          });
  
          uloop.run();
          print("run() returned\n");
  %}
  -- End --
  
  -- Expect exitcode --
  4
  -- End --

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