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kotlinlang

Hi everyone, simple question:

I have a JsonObject:
```val jsonObject = jsonElement.jsonObject```
How do I add a new entry to the object? (something like this:)
```jsonObject.addProperty(name, value)```
(name and value are both Strings)

`JsonObject` are immutable; there's no great solution (see this thread): <https://kotlinlang.slack.com/archives/C7A1U5PTM/p1607458147418900>

I'm completely in favor of immutability, your update extension function will do nicely, thanks!