return idx.Lookup(k)
		}
		h.filter.indexMatches = func(a any) bool {
			return idx.objectHasKey(a.(I), k)
		}
	}
}

// FilterSelectsNonEmpty only includes objects that select this label. If the selector is empty, it is not a match.
func FilterSelectsNonEmpty(lbls map[string]string) FetchOption {
	return func(h *dependency) {
		h.filter.selectsNonEmpty = lbls
	}
}