function T() { this.a='a' }
>undefined
T.prototype = { o: { p:1 }  }
>Object
t1 = new T
>T
t2 = new T
>T
t1.o.p = 2
>2
t2.o.p
>2 ---------------- FAIL
T.prototype = { init: function() { this.o = { p:1 } }  }
>Object
function T() { this.a='a'; this.init() }
>undefined
T.prototype = { init: function() { this.o = { p:1 } }  }
>Object
t1 = new T
>T
t2 = new T
>T
t1.o.p = 2
>2
t2.o.p
>1 ---------------- SUCCESS