code: @Override
      public <Instance> boolean isInstance(Instance instance) {
          if (instance instanceof CompositeObject) {
              Object delegate = ((CompositeObject) instance).getDelegate();
              return isDatastoreType(delegate);
          }
          return false;
      }
docs: Determine if a given instance is a datastore type handled by this manager.
  
  @param instance
  The instance.
  @param <Instance>
  The instance type.
  @return <code>true</code> if the instance is handled by this manager.