Re: [heycam/webidl] Named properties object: allow symbols in [[DefineOwnProperty]] and [[Delete]] (#963)

> Firefox throws (it should't since no `"use strict"` there, but ok)

The throwing without `use strict` is just a bug I think, we'll fix that.

> In perfect world, it would be nice to do the same for `WindowProperties`. I don't really have hard opinion on whether symbols should be allowed or what descriptors should they have.

I don't feel great about fiddling with some of these legacy objects, but it doesn't seem too complicated for us to change this in Gecko I think (limited to symbols). Making @@toStringTag non-configurable is fine by me too.


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