@Test
    fun testShallowCopyOfDataClass_onChangeRecord_copiedRecordChangedToo() {
        val subj = TestItemDataClass("Jane", 12)
        val shallowCopySubj = subj.copy()

        subj.name = "Bear"

        assertEquals("Bear", subj.name)
        assertEquals("Bear", shallowCopySubj.name) // FIXME crash here, it behaves like deep copy
    }


    private data class TestItemDataClass (
        var name: String, var count: Int
    )