filterIsInstance shouldn't state that is performing a unsafe cast?

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Next statement throws a ClassCastException:

val foo = listOf(listOf("hello")).filterIsInstance<List<Int>>().first().first()

There are no compile errors or warnings, nor is there anything in the Kotlin documentation that explicitly mentions this behavior. I understand the type erasure feature and that filterIsInstance is simply performing an is check. However, shouldn’t this behavior be documented?

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I believed it’s mentioned here:

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