Undoing changes when loading nodes

[Chique80]

Loading a node undoes any unsaved changes on that node.
For exemple, let's say that there is a node with attribut "A" and "B" (both at 0) in the database. We execute the following code.

node1 = GraphManager.load(...)
node1.putProperty("A",1)

node2 = GraphManager.load(...)
node2.putProperty("B",1)

GraphManager.saveChanges()

After the execution, the attribut of "B" in the database is 1, but "A" is still at 0.