> throw() { throw new CancelError() }
>
This should be `throwIfRequested` I think, e.g.
throwIfRequested() {
if (this._requested)
throw new CancelError();
}
}
> What would be the recommended way of keeping the internal state
> private? With a WeakMap?
>
Spec-defined objects can have "internal slots" (essentially private
fields), which can be simulated with WeakMaps. Although a polyfill would
most likely just use underscored names.
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