node.js timers are borken

checktimers.js

// 2016-12-10 jorge@jorgechamorro.com
// node.js timers are borken: node checktimers.js errs all the time
// But this won't ever err in a browser: copy-paste in any browser's console 
// Update: somewhere between node 0.10.26 and 0.12.0 this has been fixed

(function (ctr,flag,errors) {

  function _1 () { flag= 0 }
  function _2 () { errors+= flag }
  function _3 () { flag= 1 }
  function _4 () { errors+= !flag }

  (function loop (t,i) {
    t= 5, i= 20, ctr+= i*4;
    while (i--) {
      setTimeout(_1, t+=1);
      setTimeout(_2, t+=1);
      setTimeout(_3, t+=1);
      setTimeout(_4, t+=1);
    }
    setTimeout(loop, t+=20);
  })();

  (function logger (str,percent) {
    setTimeout(logger, 333);
    percent= (100 * errors / ctr).toFixed(2);
    str= '['+ ctr+ '] ERRORS: '+ errors+ ' ['+ percent+ '% WRONG ORDER]\r';
    this.navigator ?
        console.log(str) :
        process.stdout.write(str);
  })();

})(0,0,0);