Updates:
        Status: WorkingAsIntended

Comment #1 on issue 3611 by [email protected]: Adding a new object property is very slow
https://code.google.com/p/v8/issues/detail?id=3611

Benchmarking is hard, one-liners are pretty much guaranteed to be useless or even misleading. See http://jsperf.com/unknown-hash-key/3 for an attempt to focus more on the issue in question and less on various kinds of overhead and contortion.

That said, adding properties is slower than overwriting them. This is expected.

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