Re: [whatwg/fetch] Is a missing HeadersInit treated differently from an empty one? (#479)

OK, so that sounds like we should make `record` be more like `sequence` than `dictionary` in the IDL spec, right?  That is, it requires an object for its value, doesn't have special "must be optional in trailing position" stuff, is distinguishable from nullable types, etc.  Unlike `sequence`, any object can be a `record`, which mostly affects distinguishability` checking.

I would be quite happy with that, since that's what Gecko implements for MozMap already.  I just wish I hadn't wasted the time to align Gecko with the current IDL spec here.  :(

If we're all agreed with that, do you or @jyasskin have bandwidth to update IDL?  If not, I can try to do that.

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