What are you wanting to represent with it? If you're just trying to represent whether something is present or not, the `Option` type will do well. It's also typesafe, and won't crash the program if you try to use it as a normal value. On the other hand, you can use `nil` for ref types, which is a direct equivalent of `NULL` in C, aka `0` used as a pointer that points to nothing.
In Nim, if you try to `get` an Option value that is `None`, it'll raise an exception, similar to what you might expect from a language like Python or JavaScript. On the other hand, trying to use a `nil` value will result in a program crash, like in C. In most cases, you should use `Option` if you need something that could be none, and avoid nil, even on reference types.
