Detecting the "type" of a DOM object

Brendan Eich brendan at
Sun Jun 24 05:51:48 PDT 2012

David Bruant wrote:
> Instead of adding a new [[instanceofHint]] internal property, maybe the
> [[NativeBrand]] could be reused.

+1 on that, which suggests [[NativeBrandMatch]] instead of 

Your proposal is more general but I think we should extend HasInstance 
only very concretely, with what's needed for WebIDL, and probably for 
any such system that reflects nominal types.

Cc'ing Tom in case he missed this thread, including your message to 
which I am replying here.

(Nit: the 'o' in 'of' should be capitalized if we do use the name you 


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