Merge calculates changes incorrectly

[ledsoft]

When merging an instance with a reference to another instance, JOPA calculates changes on the reference and considers it a change if any of its attributes have changed, even though it should only check that it is the same instance. An example:

A.hasB = B;
B.name = "Test";
persist(A, B);
B.name = null;
result = merge(A)
=> hasChanges(A) == true, which is wrong, because B is still the same instance.
Correct behavior:
hasChanges(A) == false && result.hasB.name == "Test", because there is no cascading to B, so the value from storage should be used.

[ledsoft]

Fixed in 0.9.4.