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kotlinlang

Anybody had a problem when Kotlin couldn't cast Swift `Int64` to `KotlinLong?` , example in thread.

Swift code:
```let long: Int64 = 5
kotlinFun(value: long)```
Kotlin code:
```fun kotlinFun (value: Long?) {}```

This works:
```let long: Int64 = 5
kotlinFun(value: KotlinLong(value: long))```

But if you have `Int64?` then you have to do something like this:
```let long: Int64? = 5
if long == nil {
    kotlinFun(value: nil)
} else {
    kotlinFun(value: KotlinLong(value: long!))
}```
The same thing happens with `Int` (and other numeric types), but not with `String`
Any better solutions?

I would expect something like
```kotlinFun(value: long.map { KotlinLong(value: $0) })
```
to work, not sure if there's a simpler way