function Vector(a, b) {

  this.a = a;
  this.b = b;}
var x = new Vector(1, 2);var y = new Vector(1, 3);var z = new Vector(1, 'a');
print( %HaveSameMap( x, y ) ); //trueprint( %HaveSameMap( x, z ) ); //false
x.b;print( %HaveSameMap( x, z ) ); //trueprint( %HaveSameMap( y, z ) ); //false
y.b;print( %HaveSameMap( y, z ) ); //true

As we can see if the object property types are different they don't share 
their hidden class until we try to access the property in elder object 
which type is different. Can anyone give a clear explanation what is 
happening "behind the scenes". 

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