Set a Kotlin `lateinit var` back to null ;)

uninit.kt

(object {
    private lateinit var demo: String

    fun something() {
        demo = "test"
        println(demo) // test

		// Regular Java reflection, no Kotlin magic, but isn't name safe
        uninit("demo") // in `this`
		
		// Requires bundling Kotlin reflection, but no more strings
		::demo.javaField!!.set(this, null)
		
        println(demo) // UninitializedPropertyAccessException
    }
}).something()

fun Any.uninit(field: String) = javaClass.getDeclaredField(field).apply { isAccessible = true }.set(this, null)