Re: [w3c/editing] Seeking feedback on delayed clipboard rendering proposal (Issue #417)

>> Is there any value in having the clipboard item data ever be a Promise?

> Yes, because we want to allow sites to construct the data asynchronously, but eagerly.

Right, that makes sense. Four options, then:

- Eager: a `DOMString` or `Blob`
- Eager, but asynchronous: a `Promise` of a `DOMString` or `Blob`
- Deferred: a callback returning a `DOMString` or `Blob`
- Deferred, but asynchronous: a callback returning a `Promise` of a `DOMString` or `Blob`

> However, it's apparently not possible for a Promise to be part of a union.

If that's the case, then the callback will have to return a promise. That seems okay, but I think it'd be more ergonomic for the application developer to return a value synchronously if they want to.

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