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With ES6 we can get rid of the overridden Object.prototype.toString function and define @@toStringTag properties on objects to get the same effect. http://www.w3.org/mid/CAJ8+Gogzsgr4Quw-SVvKwJX7y5LsaeSG+fWL8DHzLrvaCfrj=Q@mail.gmail.com describes the solution.
https://github.com/heycam/webidl/commit/4990cd399d6b0d9ff2cc4bd3c66b6cc93cc5165f