kotlin 
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fun <I> calculateStuff(valueType: Class<out I>, defaultValue: I): I {
    return defaultValue;
}

kotlin 
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inline fun <reified I> calculateStuff(defaultValue: I): I {
    // do some work

    return defaultValue;
}

kotlin 
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val myVar1 = calculateStuff("")             // myVar1 is String
val myVar2 = calculateStuff<String?>(null)  // myVar2 is String?