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<@U25U0KPFT> I agree with that, and I see that it would add some complexity to support it as json. Making `javax.json.JsonObject` is also a bit tricky, since a copy on write would result in a new instance, and that would be very problematic if the user kept a reference to it. I think we'd actually need to reimplement the whole thing. I think there is a mechanism we can plug into so we can return `TornadoJsonObject` instead, so it might be possible to do cleanly.