The NaN of types (in D)

[Joseph Rushton Wakeling]

On Monday, 12 October 2020 at 14:11:22 UTC, Paul Backus wrote:
> The issue with null references is not related to memory safety. 
> NullPointerException in Java is not a memory-safety error, for 
> example. The issue with nullable references is that you have to 
> check every reference for null before you use it, or your 
> program will crash.
>
> By contrast, NaN will not crash your program if you forget to 
> check for it before using it in an expression.

Right.  I'm just not sure I follow why the ø Stefan is defining 
wouldn't behave more like NaN than a null pointer.