[Pharo-users] How fuel deals with circular reference ?

I have a class A that has an instance variable the references an instance of Class B , but also Class B has an instance variable the references an instance of Class A. Basically its a GUI that references its model and the same model referencing the same instance of GUI. How Fuel deals with such scenario because I saw that it created an output of 1.5 mbs for several instances of my model class ? Is there any danger of having such circular references or it does not matter because afterall they are just pointers ?