I'm not sure \ is better than "fun", fun does have a certain clarity when reading code, and it's only three extra keystrokes if you include the space, all easie

I'm not sure \ is better than "fun", fun does have a certain clarity when reading code, and it's only three extra keystrokes if you include the space, all easier to type than backslash which needs a pinky stretch. Honestly I could go either way though. Also note that C# loses brevity as soon as there are more args than one (such as with commonly used Seq.iteri or folds) because of having to type the "(,)" for C# (the parens annoyingly requiring shift keys) instead of just a space.