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  1. or download this
    > hash = {a:1}
Object { a: 1 }
...

> array.__proto__.__proto__
Object { … }
  2. or download this
    > h={}                         // empty hash?
Object {  }

> h["constructor"]             // well, beware of inherited attributes
function Object()
  3. or download this
    > h = Object.create(null)
Object {  }

> h["constructor"]
undefined