People and programs change their minds all the time. A lot of behaviors we consider intuitive rely on some form of cancelation. People gave a few examples in t

People and programs change their minds all the time. A lot of behaviors we consider intuitive rely on some form of cancelation. People gave a few examples in this subtopic: https://news.ycombinator.com/item?id=14962684 https://news.ycombinator.com/item?id=14962684