C# is pretty great, I use it everyday. But if you've even spent significant time in F#, you return to C# land asking some of the same questions Don does. A gre

C# is pretty great, I use it everyday. But if you've even spent significant time in F#, you return to C# land asking some of the same questions Don does. A great example is C# 8's Nullable Reference Types feature, touted as (partial) solution to the Null object references. But it isn't air tight, or even water tight. Even if you annotate everything correctly, you can still slip null refs past the compiler. But F#'s solution to the Null ref issue is much simpler, don't allow nulls at all. Force the developer to use Option<T> to express the absence of value. F# did it correctly the first time and has benefitted ever since.