Highlights are currently rounded at the edges, which makes it difficult for editors and compositors to tell whether the highlight applies to surrounding punctuation, spaces, and other narrow characters. Additionally, the blue boxes that appear around the highlights when they are clicked on often extend past the text that was actually selected, which can cause further confusion for those who need to edit things precisely.

Straight edges on highlights would allow for a clearer and more accurate view of what is being commented on. Please make this is an option in the Commenting preferences.