Long try's Shortform

Has anyone suggested it yet? I think LW should have a system to notice users whether they've read a linked article or not when they're reading inside another. That's a basic & universal need, yet I'm surprised it's not implemented. On other sites, it's simply the link's color: blue if unread, violet if read. If you guys decide to opt for a more sophisticated system, then I propose using 8 rainbow colors: black means the user hasn't read it, red indicates once, orange twice... purple 7 times or more. In case you're worried the various long link shades may distract people, then just apply them to that circle indication at the end of the link. You could make it bigger and bold for readers to distinguish the colors.