ExperimentalCoroutineDispatcher.close can shutdown enclosing thread of the same type

[qwwdfsad]

 while (true) {
            Thread.sleep(100)
            CoroutineScope(Dispatchers.Default).launch {
                ExperimentalCoroutineDispatcher(4).close()
                println("created and closed")
            }
        }

will print created and closed N times (where N is cores count of target machine)