The long i sound in some editions of the Qur’ān is written with a kasrah followed by a diacritic-less y, and long u by a ḍammah followed by a bare w. In others, these y and w carry a sukūn. Outside of the Qur’ān, the latter convention is extremely rare, to the point that y with sukūn will be unambiguously read as the diphthong , and w with sukūn will be read .
the long i sound in some editions of the qur’ān is written with a kasrah followed by a diacritic-less y and long u by a ḍammah followed by a bare w in others these y and w carry a sukūn outside of the qur’ān the latter convention is extremely rare to the point that y with sukūn will be unambiguously read as the diphthong  and w with sukūn will be read 