Only if you've been around people who say it a lot and have the cultural context. The internet, and Hacker News, is not that place. There are plenty of people

Only if you've been around people who say it a lot and have the cultural context. The internet, and Hacker News, is not that place. There are plenty of people on here who will read "could" and "couldn't" as the actual words they are rather than the phrase they're a part of.