NULL indicator in Variant

[Steve Teale]

How big a deal would it be to add a NULL indicator to the VariantN struct.

I use the term NULL as opposed to null deliberately. Variant already 
provides the hasValue() method, which can serve as a null indicator. But 
in using it as a parameter in database modules, it would be useful to be 
able to give a Variant instance a type, as in v = "", but also to set it 
explicitly as NULL with setNull() or whatever.

Could this fly without breaking existing code?

Steve