docs: private static Set<EquivalentAddressGroup> stripAttrs(List<EquivalentAddressGroup> groupList) {
      Set<EquivalentAddressGroup> addrs = new HashSet<>(groupList.size());
      for (EquivalentAddressGroup group : groupList) {
        addrs.add(new EquivalentAddressGroup(group.getAddresses()));
      }
      return addrs;
    }