[heycam/webidl] Track PR #364 (#376)

Following PR #364 , file issues with:

- [ ] Rendering engines:
    - [ ] [Gecko](https://bugzilla.mozilla.org/enter_bug.cgi?product=Core&component=DOM&cc=bzbarsky@mit.edu)
    - [ ] [WebKit](https://bugs.webkit.org/enter_bug.cgi?product=WebKit&component=Bindings&short_desc=[WebIDL]%20)
    - [ ] [Chromium](https://crbug.com)
    - [ ] [Edge](https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/)
- [ ] Testing:
    - [ ] [web-platform-tests](https://github.com/w3c/web-platform-tests/issues/new)
    - [ ] [idlharness.js](https://github.com/w3c/testharness.js/issues/new?title=%5Bidlharness%5D%20) (used by testharness.js to run idl tests)
- [ ] Specs:


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