At my first job out of college, we were hired to create a point-of-sale system. We wrote it in Javascript, being unaware of how Javascript treats numbers. (Lik

At my first job out of college, we were hired to create a point-of-sale system. We wrote it in Javascript, being unaware of how Javascript treats numbers. (Like a rented mule.) After the first few days, the client reached out and told us that the end-of-day numbers were sometimes off by a few cents - tax totals, things like that. After a few weeks, they'd be off by significantly more. Easily the most embarrassing incident of my career, even worse than when I accidentally left a `console.log("FUCK");` in production code as a debugging tool, or when we wrote some code to generate random four-letter codes that would spew out the occasional profanity.