Re: [w3ctag/design-reviews] Imperative Shadow DOM Distribution API. (#486)

Overall I think this looks great.

One minor concern I have is with the exclusivity of the slot assignment modes, though I think my concern could easily be addressed by some syntactic sugar.

It's common to have special behavior with one child (or a few children) and some kind of default behavior for the rest. Consider the following markup:

```html
<details>
  <summary>This is the summary.</summary>
  and
  <p>these
  <p>are
  <p>the
  <p>details
</details>
```

The proposed imperative API lets you easily handle `<summary>`. It would be nice if it were easy/straightforward to implement a default slot using the imperative API, so that the rest of `<details>`'s children could be taken care of easily. Maybe something like `shadowRoot.setDefaultSlot(slot)`. You do some manual slotting and then everything not slotted ends up in the default slot.


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