Add torrent.InfoHash type alias

client.go

@@ -64,7 +64,7 @@ type Client struct {
 	// through legitimate channels.
 	dopplegangerAddrs map[string]struct{}
 	badPeerIPs        map[string]struct{}
-	torrents          map[metainfo.Hash]*Torrent
+	torrents          map[InfoHash]*Torrent
 
 	acceptLimiter map[ipStr]int
 }

misc.go

@@ -169,4 +169,7 @@ func min(as ...int64) int64 {
 
 var unlimited = rate.NewLimiter(rate.Inf, 0)
 
-type pieceIndex = int
+type (
+	pieceIndex = int
+	InfoHash   = metainfo.Hash
+)