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

I don't quite understand why delivering `Something` via a callback is more expensive than `new Something()`. (A way to avoid the "cons" of `new Something()` is perhaps to allow declaration ahead of time that the custom element won't use it, or indeed, require explicit opt-in that it's going to be used.)

(Another "cons" of `ShadowRoot` is that it's not limited to custom elements.)

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