WithoutJsonElement.kt

...
if(root is JsonArray && root.size() > 0){ //Smart cast 1
    val firstElem = root[0]
    if(firstElem is JsonObject){
        val title = firstElem.get("title") //Smart cast 2
        if (title != null && title is JsonPrimitive && title.isString){ //Smart cast 3
            val titleString = title.asString
            assertEquals("delectus aut autem",titleString)
        }
        val completed = firstElem.get("id")
        if (completed != null && completed is JsonPrimitive && completed.isBoolean){ //Smart cast 4
            val completedBool = completed.asBoolean
            assertFalse(completedBool)
        }
    }
}