OP solved it, closing

@dust55 The const to function hack does not work on all platforms

andyou: [Function: andyou],

This is the wrong entry in the array, right? Why is she in the test?

...

{ one: '1',
  two: 2,
  three: false,
  four: {},
  another: '3',
  andit: [],
  andyou: [Function: andyou],
  whatabout: { andone: 'and another', andtwo: 2, andthree: 'and again' },
  lastkey: [ [ [Array], false ], 0 ] } 

why this test expect 5 instead of 4??