Re: [w3c/webcomponents] How to define APIs only for custom element authors (#758)

One benefit of the `createdCallback` (presumably?) option is that, if we do combine all possible settings into something like `ElementConfiguration`, the API gives you an opportunity to learn by exploration of that object. 

With `new MyThing(element)`, authors would have to learn about each `MyThing` separately (although obviously good docs can help with this).

Also, if new `MyThing`s keep being added, custom elements which were written before they existed run the risk of having `MyThing`s being defined by the page instead. This may not be a concern, but it seems awkward to me.

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