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(From bug 21929 comment #2) > The [[Delete]] defined in the spec now works for ES5 but not ES6: in ES6 > [[Delete]] just returns a boolean indicating success or not and the caller > throws or not based on strict mode...
Fixed: https://github.com/heycam/webidl/commit/a4e5e47940bd7fb1e0ea9408a4d45a508c543af4