A lot of games have different overscan safe areas, specifically Nintendo 64 games. Using 2 of them as an example, Super Mario 64 would need to be zoomed in by a factor of 1.07 to avoid seeing artifacts from the VI overlay, while Paper Mario needs to be zoomed in by a factor of 1.20, or you will see a border around the invisible area that you’re probably not supposed to see. If I use integer scale, and a shader, such as crt- royale-ntsc-320px-composite.slang, the image is fine with integer scale enabled, until you adjust the overscan %. After adjusting the overscan %, vertical lines appear, more visible over lighter areas.
Is this something that occurs on real CRTs? Also, are real CRTs integer scaled?