Re: [heycam/webidl] A non-optional dictionary argument makes sense at times. (#130)

> It means that MutationObserver.prototype.observe.length is 2 instead of 1

Ah, indeed.

For what it's worth, I _can_ see a world in which having a non-optional dictionary affects .length but does not affect the argc check, effectively treating it as optional for all purposes except .length calculation.  That is in fact what I proposed for the "any" type in https://lists.w3.org/Archives/Public/public-script-coord/2014JanMar/0176.html and is a sensible thing to do.

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