HI,

> Assuming the numbers are really indicative, you’ve just shown it to be no 
> significant increase in performance. It’s also quite possible that the 
> browser is optimizing some of the checks away.

It show significant permanence increase in Chrome on mac and windows and in 
Safari.

> You made claims of much more significant improvements in a real app. If you 
> have something that might back that up, I’d be interested in seeing…

Setting Boolean and Numbers to null gave a 10% increase in performance to our 
application. I’ve not tested Objects yet.

Thanks,
Justin

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