Sorry to belabor the point, but apparently `setOf`...

# announcements

[kenkousen]

Sorry to belabor the point, but apparently setOf behaves differently than `listOf`:

@Test
        internal fun `setOf creates mutable set??`() {
            assertEquals(LinkedHashSet::class, numSet::class)
            numSet as MutableSet
            numSet.add(42)
            assertTrue(numSet.contains(42))
            //assertThrows<UnsupportedOperationException> { numSet.add(42) }
        }