Why is Object not considered a superclass for null? about language

[mraleph]

The way Null is defined in Kernel is an implementation detail. What specification says is that null is Object evaluates to false.

[lrhn]

That language specification does not include the Null Safety feature, and is no longer correct. Null is not a subclass or subtype of Object.
Implementations may cheat, but as long as you can't tell, it's OK.

As for why Null is not a subclass of Object, it's because then there is a supertype for all non-null values.
Without that, you could do, fx, T? valueOf<T extends Object>(T value, bool useValue) => useValue ? value : null; and know that the value will not itself be null.

[meg4cyberc4t]

Thanks for the answers! It's much clearer to me now how it works.