Repro for https://github.com/joyent/node/issues/8065 but with internal timers.

gistfile1.js

var timers = require('timers');

myInternalTimeout = function(callback, after) {
  var timer = {};

  timers.enroll(timer, after);
  timers._unrefActive(timer);

  timer._onTimeout = callback;

  return timer;
};

function foo() { console.log('foo'); }
var myInternalTimer = myInternalTimeout(foo, 300.1);

setInterval(function() { timers._unrefActive(myInternalTimer); }, 350);