بَيْتًا or بَيْتاً? – Where do you add the two lines (تَنْوِين) at the end?

Some readers have asked me about the correct writing of the تَنْوِين at the end of a word. I wrote about that in my book and discussed it in one of my previous newsletters. I don’t mind dealing with the topic again. So… What is correct: بَيْتًا or بَيْتاً ? Let’s have a look at[…]