[heycam/webidl] Track PR #412 (#434)

Following PR #412, 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://bugs.chromium.org/p/chromium/issues/entry?template=Defect%20report%20from%20developer&components=Blink%3EBindings&summary=[WebIDL]%20&comment&labels=Via-WebIDLRepo)
    - [ ] [Edge](https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/)
- [ ] Testing:
    - [ ] [web-platform-tests](https://github.com/w3c/web-platform-tests/issues/new?title=%5BWebIDL%5D%20)
    - [ ] [idlharness.js](https://github.com/w3c/web-platform-tests/issues/new?title=%5Bidlharness%5D%20) (used by testharness.js to run idl tests)
- [ ] Parsers:
    - [ ] [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)


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