Is the other-kind-of-null really necessary in Nullable and Variant?

[deadalnix]

On Sunday, 28 April 2013 at 16:33:19 UTC, Idan Arye wrote:
> When you use `std.typecons.Nullable` with a type that already 
> accept `null` values, you get two types of nulls - the 
> `Nullable`'s null state the the regular type's `null`:
>
>     Nullable!string a;
>     writeln(a.isNull()); //prints "true"
>     a = null;
>     writeln(a.isNull()); //prints "false"
>     a.nullify();
>     writeln(a.isNull()); //prints "true"
>

All types should be non nullable. Problem solved.