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

@bzbarsky Well, it means that MutationObserver.prototype.observe.length is 2 instead of 1, which fails a wpt test and is how I noticed in the first place.  I do not think this has big implications for web compat, though.  :)

If Anne is happy to change DOM, then I don't have any objection to closing this and leaving WebIDL as it is, although I think it's slightly sad that the IDL will be slightly more confusing.  If a confusing "optional" in an IDL were the worst problem with the web platform, we'd be in great shape.  ;)

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