Re: [whatwg/dom] Consider adding AbortController.prototype.follow(signal) (#920)

> 2. The "follow" operation has always seemed unintuitive to me, compared with a "race" or "create linked token source" style API ([described here in the context of the defunct cancelable promises proposal](https://github.com/tc39/proposal-cancelable-promises/blob/0e769fda8e16bff0feffe964fddc43dcd86668ba/Cancel%20Tokens.md#combining-cancel-tokens)). But, I don't trust my inutition here. Would someone with more experience be able to discuss the differences between these, and argue for one or the other?

`race` is the approach I went with in https://esfx.js.org/esfx/api/async-canceltoken/canceltoken.html#_esfx_async_canceltoken_CancelToken_race_member_1_ (which is the successor to `prex` and based on my [Cancellation Protocol](https://github.com/tc39/proposal-cancellation/issues/22) proposal).

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