V8 Bug?

js-critical-bug.js

// https://blog.gaplotech.com/content/images/2016/06/Screen-Shot-2016-06-22-at-22-09-29.png
// Result not consistent : 12291 false, 37709 true
for(var i=0; i<50000; ++i) {
	console.log(typeof null === 'undefined')
}
// OR
for(var i=0; i<50000; ++i) {
	console.log(typeof null == 'undefined')
}

// Quick fix
for(var i=0; i<50000; ++i) {
	console.log(null === undefined)
}