BUG: The nullable property is not propagated through primitive types

[cpcloud]

Because the type() method just blindly returns instances of particular types (which are nullable by default).

[kszucs]

This should be resolved by #1366 because datatypes are passed to ValueExpr objects.

[kszucs]

@cpcloud What should be the promotion logic for operation involving both nullable and non-nullable operands?

I guess if any of the operands are nullable then the result should be nullable, please confirm.

[kszucs]

Ohh, the implicit casting already nicely handles that.

[cpcloud]

@kszucs This was fixed by the PR that added Argument right?

[cpcloud]

Ah yes, looks like it does.