The Option type there isn't type safe. E.g. https://play.golang.org/p/CiQLf4yWhCO doesn't throw a type error for the Get function even though I've omitted the null check.
Sorry, but that's just ridiculous. Obviously the language can't prevent you from defining your Option type incorrectly. The point is that it's not possible to misuse it.
Go constantly requires boiler-plate checks for errors, null values etc. without the type checker helping ensure you've checked for an error or null value.
