:Ms2ger (he/him; ⌚ UTC+1/+2) Reporter
	Description • 11 years ago

      No description provided.

	Boris Zbarsky [:bzbarsky] Assignee
	Comment 1 • 11 years ago

This is going to need JS engine support.

This object needs to be a proxy _and_ emulate undefined, which we don't support right now in the JS engine.

	Boris Zbarsky [:bzbarsky] Assignee
	Comment 2 • 11 years ago

It's conceivable that the right answer is a new proxy JSClass that sets the relevant bit, or something...  Certainly seems like the path of least resistance.  Ccing some people who know proxies.

	Boris Zbarsky [:bzbarsky] Assignee
	Comment 3 • 11 years ago

I guess another option is to add a proxy trap for this and have EmulatesUndefined() call that as needed, since we always send proxies through the slow OOL path for this stuff anyway?

	Luke Wagner [:luke]
	Comment 4 • 11 years ago

I think Waldo added the undefined emulation, so probably the right one to ask about this.

	Boris Zbarsky [:bzbarsky] Assignee
	Comment 5 • 10 years ago

Eric made this possible in bug 924720.

	Boris Zbarsky [:bzbarsky] Assignee
	Comment 7 • 10 years ago

https://hg.mozilla.org/integration/mozilla-inbound/rev/05d5f2815f92

	Carsten Book [:Tomcat]
	Comment 8 • 10 years ago

https://hg.mozilla.org/mozilla-central/rev/05d5f2815f92