behavior of equality checking with nulls

[natebrennand]

what is the expected behavior here? Should comparisons with a null value ever pass? (even if it's two nulls)

int x;
int y = 0;
int z;

assert(x == y)  // should fail
assert(x == z)  // should pass?

[schlosser]

assert(x == z) will pass. both are null, null is universal within a type.

assert(x == y) will fail. 0 != null.