title: Is this binding breaking?
body: <p>If I a dp a and a dp b, if i bind b to a, say a is 100, b becomes 100, if later assign b to 80 would that break the binding? so if I later assign a t0 70 b will not get updated? maybe a better approach would be to change b in a's on value changed method, then the following example would work?</p>