Comment #1 on issue 3819 by impinball: Duplicate __proto__ properties should be a syntax error
https://code.google.com/p/v8/issues/detail?id=3819

If I understand correctly, the second example should not throw. This is much related to that name for a computed property. It would be the cause of a whole new class of atrocious, hard-to-find bugs and security holes.

```js
JSON.parse(String.raw `
{
  "foo": 2
  "__proto__": null
}
`);
// Well...that was a bad payload that nothing can be done about
```

The other three are still okay.

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