The idea here isn't to replace every T with Option[T]. The idea is to locate the places where incoming data might be absent and handle it there, so that the oth

The idea here isn't to replace every T with Option[T]. The idea is to locate the places where incoming data might be absent and handle it there, so that the other 90% of your code can just use T with wild abandon. Like most methodologies, if you do it wrong it will be a fiasco and if you do it right it won't be so bad.