Re: [dom] Let DOMTokenList.prototype.add() return false if there are no supported tokens (#111)

Have you considered just giving up on this boolean return value bit and moving to a tristate return value, all truthy, representing "supported", "not supported", and "no supported set" (in fact, they could just be those strings)?  Then a falsy return value would mean API not implemented yet (reducing the complexity of writing proper feature-detection in the face of downrev clients that don't implement the API yet), and a truthy one would tell you exactly what's going on with the support state.

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