Re: [whatwg/streams] Test or specification problem with TransformStream readable.cancel and calling controller.error (Issue #1296)

Hmm, logging transformerDict.cancel at https://github.com/whatwg/streams/blob/007d729f1476f7f1ea34731ba9bd2becb702117e/reference-implementation/lib/abstract-ops/transform-streams.js#L143 shows this:

```js
  function invokeTheCallbackFunction(reason) {
    const thisArg = utils.tryWrapperForImpl(this);
    let callResult;

    try {
      callResult = Reflect.apply(value, thisArg, [reason]);

      callResult = new Promise(resolve => resolve(callResult));
      return callResult;
    } catch (err) {
      return Promise.reject(err);
    }
  }
```

And the returned promise is unresolved, which means listening on this promise takes an extra round. That's webidl2js layer, not sure why it's implemented like this, I should check the spec and also try updating webidl2js to v17.

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