a more efficient solution: ``` inline fun <reif...

# announcements

[kirillrakhman]

a more efficient solution:

inline fun <reified T1, reified T2> T1.assertIsNot(of: T2?, message: String? = null): T1 {
    kotlin.test.assertFalse(this is T2, message)
    return this
}

fun <T> of(): T? = null