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kotlinlang

In Java, we can add/remove property in JSONObject. In serialization, JsonObject is Map that can not be change. Is any suggestion to migrate this logic?

`.toMutableMap()`
You can create a new json object from a map 
`JsonObject(map)`

I actually just append keys and create a new object from that

try
```fun JsonObject.put(key: String, value: Long): JsonObject {
    return JsonObject(this + (key to JsonPrimitive(value)))
}```


but it seems have overhead, maybe i should give up extension function