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Hey, When I use boundingRect with String, and supply .usesFontLeading as one of the options, I get an inaccurate height for some reason. Why is that?

I'm using boundingRect to calculate the height of a String, I'm using Ubuntu as my font, and when I supply .usesFontLeading as one of the options alongside .usesLineFragmentOrigin the height is completely different to what I expect. Here is the code I'm using for reference: func height(withConstrainedWidth width: CGFloat, font: UIFont, maxLines: CGFloat = 0) -> CGFloat {         let constraintRect = CGSize(width: width, height: .greatestFiniteMagnitude)         let boundingBox = self.boundingRect(with: constraintRect, options: [.usesFontLeading, .usesLineFragmentOrigin], attributes: [             NSAttributedString.Key.font: font         ], context: nil)         var size = boundingBox.size         if maxLines > 0 {             size.height = min(size.height, CGFloat(maxLines) * font.lineHeight)         }         return ceil(size.height)     } Firstly, what does .usesFontLeading even do, and why is it that the result I'm getting an unexpected result. Note: self is String because I've extended the String class.