Status: New
Owner: ----
New issue 3662 by impinball: Object.seal really slow when iterated
https://code.google.com/p/v8/issues/detail?id=3662
On my machine, I saw that a sealed object iterated 10x slower than both a
frozen object and a normal object. This should be faster to iterate given
its nonextensibility, with similar optimization paths to frozen objects.
The key difference is that the values may change.
http://jsperf.com/performance-frozen-object/20
I would like to note that the prototype chain is still modifiable, so such
a runtime check can conditionally render that impossible. In that case, it
still should be able to use a fast code path for own keys.
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