From the standpoint of the concurrency scheme I'm proposing, it's OK to move the cell in the GC. Then it becomes a standard GC moving problem. In JSC we don't

From the standpoint of the concurrency scheme I'm proposing, it's OK to move the cell in the GC. Then it becomes a standard GC moving problem. In JSC we don't move cells for other reasons, and the point of saying that they don't move is that the object model itself does not require the cell to ever move.