Using `ref T` heap allocates the data which means if you have a `seq[ref int]` you now have a pointer indirection per each element. So your cache is going to get quite thrashed. Options do use a bool and that can take up more space. A memory efficient way of handling optionals is to use a sentinel value. An [example](https://play.nim-lang.org/#ix=3YBt). Optionals do also heavily encourage you to unpack them versus nilables.
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