Re: [whatwg/dom] Add abortSignal.addAbortCallback (PR #1425)

bakkot left a comment (whatwg/dom#1425)

Calling `.addAbortCallback(yourCleanupFunction)` works just as well as using a symbol; arbitrary objects can have a method named `"addAbortCallback"`. There's no need to introduce a new symbol here.

The main reasons to use a symbol-based rather than string-based protocol are when this is a protocol that arbitrary objects might implement (like Iterator), or when you want to switch on the presence of the protocol (like Promise). Neither holds here.

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