(function() {

'use strict';

​

var f = false;

​

/// THIS OBVIOUSLY WORKS

console.log('OBVIOUSLY', f === false, f == false);

​

f.v1 = 1;

f.o = {

  popo: "koko",

  tutu: "vicar"

}

​

/// THIS STILL WORKS:

console.log('STILL', f === false, f == false);

​

/// BUT (!):

console.log('BUT (!)', f.v1, f.o);

​

}());