if c.EquivalentResourceRegistry == nil {
		if c.RESTOptionsGetter == nil {
			c.EquivalentResourceRegistry = runtime.NewEquivalentResourceRegistry()
		} else {
			c.EquivalentResourceRegistry = runtime.NewEquivalentResourceRegistryWithIdentity(func(groupResource schema.GroupResource) string {
				// use the storage prefix as the key if possible
				if opts, err := c.RESTOptionsGetter.GetRESTOptions(groupResource); err == nil {