Support for AbortSignal.reason

[KnorpelSenf]

The web spec was changed in whatwg/dom#1027 to support a reason when aborting.

[Kikobeats]

related: https://github.com/nodejs/node/blob/dabda03ea9ef4baab20e3a377a753174475eb468/lib/internal/abort_controller.js#L139