elds whenever a class is changed, the classes of this model are manipulated through proxies that intercept any changes and update all caches of inherited field through out the entire class hierarchy.
This indirection makes class operation more expensive than in other models where classes are simple meta-tables.
All functions of the <code>cached</code> model manipulates proxies of actual classes.
The <code>cached</code> model introduces the new function <code>allmembers</code> that return an iterator for all