Must built-in prototypes also be valid instances? (Was: Why DataView.prototype object's [[Class]] is "Object"?)

Kevin Smith khs4473 at
Tue Oct 2 13:08:31 PDT 2012

> On the other hand, if you have many instances that need to be branded I
> suspect that the distributed symbol based technique is going to have a
> better performance profile than the WeakMaps.

Is this true?  Are there performance "caveats" that come with current
WeakMap implementations?

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