Reword a comment am: 91ef22f9 am: af5cd646 am: 9bed101b

        // inline runnable that's instantiated at each loop run and a runnable that's instantiated

        // once for all.

        val tempRunnable = object : Runnable {

            // StringBuilder is NOT thread-safe, and that's the point ; here it's part of the point

            // that both runnables run on the same thread so if anything is wrong in that space

            // it's better to use a class where things go wrong

            // Use StringBuilder preferentially to StringBuffer because StringBuilder is NOT

            // thread-safe. It's part of the point that both runnables run on the same thread

            // so if anything is wrong in that space it's better to opportunistically use a class

            // where things might go wrong, even if there is no guarantee of failure.

            var memory = StringBuilder()

            override fun run() {

                memory.append("b")