[uryga]

distinguishing `Some(null)` and `None` is often considered a feature of Optional ;)

to use a tired example: when getting a value out of a map via some `myMap.get(key)`, you may want to distinguish "not present" = `None` and "present, with value null" = `Some(null)`

the right solution is to just not have nulls in the first place, then there's no problem ;)