Igor Stasenko ha scritto:
> 
> yes, i raised this topic exactly from this reason.
> What i'm not sure that is this change is so badly needed.
> Maybe its only me who get stuck with a problem how to deal with sets
> where nils are meaningful and useful value.
> 

Could it be that you're possibly missing an abstraction here? why not 
use a different object, specialized for your needs, to represent your 
null value?

	Giovanni