[heycam/webidl] Track PR #286 (#336)

File issues with:
- [ ]  [Gecko](https://bugzilla.mozilla.org/enter_bug.cgi?product=Core&component=DOM&cc=bzbarsky@mit.edu)
- [ ]  [WebKit](https://bugs.webkit.org)
- [ ]  [Chromium](https://crbug.com)
- [ ]  [Edge](https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/)
- [ ] [idlharness.js](https://github.com/w3c/testharness.js/issues/new?title=%5Bidlharness%5D%20) (used by testharness.js to run idl tests)
- [ ] [widlparser](https://github.com/plinss/widlparser/issues/new) (used by Bikeshed)
- [ ] [WebIDL parser](https://github.com/w3c/webidl2.js/issues/new) (used by idlharness.js)
- [ ] Related specs

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