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[Bug 12458] Interface objects should be Functions

From: <bugzilla@jessica.w3.org>
Date: Mon, 23 May 2011 03:40:59 +0000
To: public-script-coord@w3.org
Message-Id: <E1QOM0p-0005NP-08@jessica.w3.org>
http://www.w3.org/Bugs/Public/show_bug.cgi?id=12458

--- Comment #10 from Cameron McCormack <cam@mcc.id.au> 2011-05-23 03:40:56 UTC ---
Another point is that interface objects also have to respond to [[HasInstance]]
(so that you can do `document instanceof Node`), which for native objects is
only defined for Functions.  The current Proxy proposal does not support a trap
for [[HasInstance]], nor does it have trap that would allow an interface object
implemented as a Function object to return "object" when typeof is applied to
it.  This is another issue that would prevent pure JS implementations of the
DOM, which some people want to do.

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