(tested) fix redis to pass tests

* delete info hash count key from redis (replaced with SCARD on infohash set)
* add GC test
* add peer.Addr() functio to always return unwrapped address if 4to6 appear

middleware/hooks.go

@@ -125,7 +125,7 @@ func (h *responseHook) appendPeers(req *bittorrent.AnnounceRequest, resp *bittor
 	}
 
 	switch addr := req.Peer.Addr(); {
-	case addr.Is4(), addr.Is4In6():
+	case addr.Is4():
 		resp.IPv4Peers = mergePeers(resp.IPv4Peers, peers, max)
 	case addr.Is6():
 		resp.IPv6Peers = mergePeers(resp.IPv6Peers, peers, max)

middleware/jwt/jwt.go

@@ -95,7 +95,7 @@ func NewHook(cfg Config) (middleware.Hook, error) {
 
 	log.Debug("performing initial fetch of JWKs")
 	if err := h.updateKeys(); err != nil {
-		return nil, errors.New("failed to fetch initial JWK Set: " + err.Error())
+		return nil, fmt.Errorf("failed to fetch initial JWK Set: %w", err)
 	}
 
 	go func() {