Re: [heycam/webidl] Specify open dictionaries. (#180)

One point I think is missing in that analysis is that the records vs. classes perspective TC39 has arrived at is explicitly derived from developer expectations and common coding patterns, as I tried to point out. Developers, in their own code, work with open-ended records via methods like `Object.keys` or `Object.assign`. They do not use for-in loops (at least not without a hasOwnProperty guard). In other words, this isn't a TC39 vs. developers dichotomy; I think TC39 and developers are fairly aligned on this.

So I think options 3 and 4 would be surprising to developers, as it would cause platform code to behave in unexpected ways that are not natural for normal JavaScript libraries.

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