Hey oh
Partly digested potato is usually OK, and usually fit for mashed only, I find. It's when they develope that black star center that they are next to useless, unless you know what to do with mash
Interesting article on solanine. I have always eaten green potato without trouble. What I was taught years and years ago was that the solanine was water souluable. So, after removing the green to dice and boil potatos, and throw away the boil water, and rinse the boiled potatos when done. And that is what I have always done, and never had a problem with them.