Too Long; Didn't Read
I’ve said it before, but I’ll say it again. As much as we’d like to think it’s the case, our Haskell code doesn’t work just because it compiles. This is why we have <a href="https://mmhaskell.com/blog/2017/4/10/putting-your-haskell-to-the-test" target="_blank">test suites</a>. But even if it passes our test suites this doesn’t mean it works as well as it could either. Sometimes we’ll realize that the code we wrote isn’t quite performant enough, so we’ll have to make improvements.