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kotlinlang

This might be an excessive use of Kotlin, but of the three examples, which would you rather go with?
:one:
```
val channel = payload.obj("channel")?.string("id")
val userId = payload.obj("user")?.string("id")
val text = payload.obj("message")?.string("text")
val responseUrl = payload.getString("response_url")
```
:two:
```
val (channel, userId, text, responseUrl) = payload.run { listOf(
    obj("channel")?.string("id"),
    obj("user")?.string("id"),
    obj("message")?.string("text"),
    getString("response_url")
)}
```
:three: 
```
val (channel, userId, text) = payload.run { Triple(
    obj("channel")?.string("id"),
    obj("user")?.string("id"),
    obj("message")?.string("text")
)}
val responseUrl = payload.getString("response_url")
```