code: public <T extends Assignable> ServiceExtensionLoader addOverride(final Class<T> extensionClass,
          final Class<? extends T> extensionImplClass) {
          addToCache(extensionClass, extensionImplClass);
          return this;
      }
docs: {@inheritDoc}
  
  @see org.jboss.shrinkwrap.api.ExtensionLoader#addOverride(java.lang.Class, java.lang.Class)