While working through the output of my scan of Ibn Abi Usaibia, I have just come across a mildly amusing OCR error. It’s caused by the fact that “ī” is often read as “f” or “r”.
Thus I have just seen a reference to “Ibn Barrf‘s defence of al-Harfrf”. It should, of course, be “Ibn Barrī’s defence of …”.
Ibn Barrf sounds like such a good name, tho!