Re: [whatwg/fetch] Aborting fetch (#523)

> I think there's a general principle that invoking a getter should be safe. And it would also mean that `obj.trailer != obj.trailer` which is also bad.

Hmm, that wasn't my intention. `.trailer` always returns the same promise, and rejecting rejects the existing promise.

Although, I think there's some existing weirdness here. Eg, the `Response` constructor always resolves the trailer promise ([step 11](https://fetch.spec.whatwg.org/#dom-response)), so it can't be later resolved with something else, as it tries to in the fetch method. As in, with the existing fetch spec, you'll never receive trailers.

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