diff --git a/client.go b/client.go
index 03bd4541..dd1c77d1 100644
--- a/client.go
+++ b/client.go
@@ -915,7 +915,7 @@ func (cl *Client) runHandshookConn(c *PeerConn, t *Torrent) error {
 	}
 	c.conn.SetWriteDeadline(time.Time{})
 	c.r = deadlineReader{c.conn, c.r}
-	completedHandshakeConnectionFlags.Add(c.ConnectionFlags(), 1)
+	completedHandshakeConnectionFlags.Add(c.connectionFlags(), 1)
 	if connIsIpv6(c.conn) {
 		torrent.Add("completed handshake over ipv6", 1)
 	}
@@ -1344,7 +1344,7 @@ func (cl *Client) newConnection(nc net.Conn, outgoing bool, remoteAddr net.Addr,
 		conn:        nc,
 		writeBuffer: new(bytes.Buffer),
 	}
-	c.PeerImpl = c
+	c.peerImpl = c
 	c.logger = cl.logger.WithValues(c).WithDefaultLevel(log.Debug).WithText(func(m log.Msg) string {
 		return fmt.Sprintf("%v: %s", c, m.Text())
 	})
diff --git a/peer-impl.go b/peer-impl.go
new file mode 100644
index 00000000..41540c47
--- /dev/null
+++ b/peer-impl.go
@@ -0,0 +1,21 @@
+package torrent
+
+import (
+	"github.com/anacrolix/torrent/metainfo"
+)
+
+// Contains implementation details that differ between peer types, like Webseeds and regular
+// BitTorrent protocol connections. Some methods are underlined so as to avoid collisions with
+// legacy PeerConn methods.
+type peerImpl interface {
+	updateRequests()
+	writeInterested(interested bool) bool
+	cancel(request) bool
+	// Return true if there's room for more activity.
+	request(request) bool
+	connectionFlags() string
+	_close()
+	_postCancel(request)
+	onGotInfo(*metainfo.Info)
+	drop()
+}
diff --git a/peer_info.go b/peer_info.go
index 049ae152..fdd74c52 100644
--- a/peer_info.go
+++ b/peer_info.go
@@ -20,7 +20,7 @@ type PeerInfo struct {
 	Trusted bool
 }
 
-func (me PeerInfo) Equal(other PeerInfo) bool {
+func (me PeerInfo) equal(other PeerInfo) bool {
 	return me.Id == other.Id &&
 		me.Addr.String() == other.Addr.String() &&
 		me.Source == other.Source &&
diff --git a/peerconn.go b/peerconn.go
index 4afdd8c2..d9abf804 100644
--- a/peerconn.go
+++ b/peerconn.go
@@ -36,26 +36,13 @@ const (
 	PeerSourcePex             = "X"
 )
 
-type PeerImpl interface {
-	UpdateRequests()
-	WriteInterested(interested bool) bool
-	Cancel(request) bool
-	// Return true if there's room for more activity.
-	Request(request) bool
-	ConnectionFlags() string
-	Close()
-	PostCancel(request)
-	onGotInfo(*metainfo.Info)
-	Drop()
-}
-
 type peer struct {
 	// First to ensure 64-bit alignment for atomics. See #262.
 	_stats ConnStats
 
 	t *Torrent
 
-	PeerImpl
+	peerImpl
 
 	connString string
 	outgoing   bool
@@ -253,7 +240,7 @@ func eventAgeString(t time.Time) string {
 	return fmt.Sprintf("%.2fs ago", time.Since(t).Seconds())
 }
 
-func (cn *PeerConn) ConnectionFlags() (ret string) {
+func (cn *PeerConn) connectionFlags() (ret string) {
 	c := func(b byte) {
 		ret += string([]byte{b})
 	}
@@ -285,7 +272,7 @@ func (cn *peer) statusFlags() (ret string) {
 		c('c')
 	}
 	c('-')
-	ret += cn.ConnectionFlags()
+	ret += cn.connectionFlags()
 	c('-')
 	if cn.peerInterested {
 		c('i')
@@ -348,10 +335,10 @@ func (cn *peer) close() {
 	}
 	cn.discardPieceInclination()
 	cn._pieceRequestOrder.Clear()
-	cn.PeerImpl.Close()
+	cn.peerImpl._close()
 }
 
-func (cn *PeerConn) Close() {
+func (cn *PeerConn) _close() {
 	if cn.pex.IsEnabled() {
 		cn.pex.Close()
 	}
@@ -492,10 +479,10 @@ func (cn *peer) setInterested(interested bool) bool {
 	}
 	cn.updateExpectingChunks()
 	// log.Printf("%p: setting interest: %v", cn, interested)
-	return cn.WriteInterested(interested)
+	return cn.writeInterested(interested)
 }
 
-func (pc *PeerConn) WriteInterested(interested bool) bool {
+func (pc *PeerConn) writeInterested(interested bool) bool {
 	return pc.write(pp.Message{
 		Type: func() pp.MessageType {
 			if interested {
@@ -548,10 +535,10 @@ func (cn *peer) request(r request) bool {
 	cn.t.pendingRequests[r]++
 	cn.t.requestStrategy.hooks().sentRequest(r)
 	cn.updateExpectingChunks()
-	return cn.PeerImpl.Request(r)
+	return cn.peerImpl.request(r)
 }
 
-func (me *PeerConn) Request(r request) bool {
+func (me *PeerConn) request(r request) bool {
 	return me.write(pp.Message{
 		Type:   pp.Request,
 		Index:  r.Index,
@@ -560,7 +547,7 @@ func (me *PeerConn) Request(r request) bool {
 	})
 }
 
-func (me *PeerConn) Cancel(r request) bool {
+func (me *PeerConn) cancel(r request) bool {
 	return me.write(makeCancelMessage(r))
 }
 
@@ -573,7 +560,7 @@ func (cn *peer) doRequestState() bool {
 			for r := range cn.requests {
 				cn.deleteRequest(r)
 				// log.Printf("%p: cancelling request: %v", cn, r)
-				if !cn.PeerImpl.Cancel(r) {
+				if !cn.peerImpl.cancel(r) {
 					return false
 				}
 			}
@@ -709,7 +696,7 @@ func (cn *PeerConn) postBitfield() {
 	cn.sentHaves = cn.t._completedPieces.Copy()
 }
 
-func (cn *PeerConn) UpdateRequests() {
+func (cn *PeerConn) updateRequests() {
 	// log.Print("update requests")
 	cn.tickleWriter()
 }
@@ -832,7 +819,7 @@ func (cn *PeerConn) peerPiecesChanged() {
 			}
 		}
 		if prioritiesChanged {
-			cn.UpdateRequests()
+			cn.updateRequests()
 		}
 	}
 }
@@ -853,7 +840,7 @@ func (cn *PeerConn) peerSentHave(piece pieceIndex) error {
 	cn.raisePeerMinPieces(piece + 1)
 	cn._peerPieces.Set(bitmap.BitIndex(piece), true)
 	if cn.updatePiecePriority(piece) {
-		cn.UpdateRequests()
+		cn.updateRequests()
 	}
 	return nil
 }
@@ -1096,7 +1083,7 @@ func (c *PeerConn) mainReadLoop() (err error) {
 				c.deleteAllRequests()
 			}
 			// We can then reset our interest.
-			c.UpdateRequests()
+			c.updateRequests()
 			c.updateExpectingChunks()
 		case pp.Unchoke:
 			c.peerChoking = false
@@ -1146,7 +1133,7 @@ func (c *PeerConn) mainReadLoop() (err error) {
 		case pp.Suggest:
 			torrent.Add("suggests received", 1)
 			log.Fmsg("peer suggested piece %d", msg.Index).AddValues(c, msg.Index).SetLevel(log.Debug).Log(c.t.logger)
-			c.UpdateRequests()
+			c.updateRequests()
 		case pp.HaveAll:
 			err = c.onPeerSentHaveAll()
 		case pp.HaveNone:
@@ -1157,7 +1144,7 @@ func (c *PeerConn) mainReadLoop() (err error) {
 			torrent.Add("allowed fasts received", 1)
 			log.Fmsg("peer allowed fast: %d", msg.Index).AddValues(c).SetLevel(log.Debug).Log(c.t.logger)
 			c.peerAllowedFast.Add(int(msg.Index))
-			c.UpdateRequests()
+			c.updateRequests()
 		case pp.Extended:
 			err = c.onReadExtendedMsg(msg.ExtendedID, msg.ExtendedPayload)
 		default:
@@ -1319,7 +1306,7 @@ func (c *peer) receiveChunk(msg *pp.Message) error {
 
 	// Cancel pending requests for this chunk.
 	for c := range t.conns {
-		c.PostCancel(req)
+		c._postCancel(req)
 	}
 
 	err := func() error {
@@ -1450,7 +1437,7 @@ another:
 	return c.choke(msg)
 }
 
-func (cn *PeerConn) Drop() {
+func (cn *PeerConn) drop() {
 	cn.t.dropConnection(cn)
 }
 
@@ -1482,10 +1469,10 @@ func (c *peer) deleteRequest(r request) bool {
 	if n < 0 {
 		panic(n)
 	}
-	c.UpdateRequests()
+	c.updateRequests()
 	c.t.iterPeers(func(_c *peer) {
 		if !_c.interested && _c != c && c.peerHasPiece(pieceIndex(r.Index)) {
-			_c.UpdateRequests()
+			_c.updateRequests()
 		}
 	})
 	return true
@@ -1511,11 +1498,11 @@ func (c *peer) postCancel(r request) bool {
 	if !c.deleteRequest(r) {
 		return false
 	}
-	c.PeerImpl.PostCancel(r)
+	c.peerImpl._postCancel(r)
 	return true
 }
 
-func (c *PeerConn) PostCancel(r request) {
+func (c *PeerConn) _postCancel(r request) {
 	c.post(makeCancelMessage(r))
 }
 
diff --git a/torrent.go b/torrent.go
index a5225518..12402c5a 100644
--- a/torrent.go
+++ b/torrent.go
@@ -277,7 +277,7 @@ func (t *Torrent) addPeer(p PeerInfo) (added bool) {
 	}
 	if replaced, ok := t.peers.AddReturningReplacedPeer(p); ok {
 		torrent.Add("peers replaced", 1)
-		if !replaced.Equal(p) {
+		if !replaced.equal(p) {
 			t.logger.WithDefaultLevel(log.Debug).Printf("added %v replacing %v", p, replaced)
 			added = true
 		}
@@ -953,7 +953,7 @@ func (t *Torrent) piecePriorityChanged(piece pieceIndex) {
 	t.iterPeers(func(c *peer) {
 		if c.updatePiecePriority(piece) {
 			// log.Print("conn piece priority changed")
-			c.UpdateRequests()
+			c.updateRequests()
 		}
 	})
 	t.maybeNewConns()
@@ -1736,7 +1736,7 @@ func (t *Torrent) pieceHashed(piece pieceIndex, passed bool, hashIoErr error) {
 			if len(bannableTouchers) >= 1 {
 				c := bannableTouchers[0]
 				t.cl.banPeerIP(c.remoteIp())
-				c.Drop()
+				c.drop()
 			}
 		}
 		t.onIncompletePiece(piece)
@@ -1782,7 +1782,7 @@ func (t *Torrent) onIncompletePiece(piece pieceIndex) {
 	// }
 	t.iterPeers(func(conn *peer) {
 		if conn.peerHasPiece(piece) {
-			conn.UpdateRequests()
+			conn.updateRequests()
 		}
 	})
 }
@@ -1946,7 +1946,7 @@ func (cb torrentRequestStrategyCallbacks) requestTimedOut(r request) {
 	defer cb.t.cl.unlock()
 	cb.t.iterPeers(func(cn *peer) {
 		if cn.peerHasPiece(pieceIndex(r.Index)) {
-			cn.UpdateRequests()
+			cn.updateRequests()
 		}
 	})
 
@@ -1974,7 +1974,7 @@ func (t *Torrent) disallowDataDownloadLocked() {
 	log.Printf("disallowing data download")
 	t.dataDownloadDisallowed = true
 	t.iterPeers(func(c *peer) {
-		c.UpdateRequests()
+		c.updateRequests()
 	})
 }
 
@@ -1984,7 +1984,7 @@ func (t *Torrent) AllowDataDownload() {
 	log.Printf("AllowDataDownload")
 	t.dataDownloadDisallowed = false
 	t.iterPeers(func(c *peer) {
-		c.UpdateRequests()
+		c.updateRequests()
 	})
 }
 
@@ -2027,7 +2027,7 @@ func (t *Torrent) addWebSeed(url string) {
 		},
 		requests: make(map[request]webseed.Request, maxRequests),
 	}
-	ws.peer.PeerImpl = &ws
+	ws.peer.peerImpl = &ws
 	if t.haveInfo() {
 		ws.onGotInfo(t.info)
 	}
diff --git a/torrent_test.go b/torrent_test.go
index 6c47a80c..2812a067 100644
--- a/torrent_test.go
+++ b/torrent_test.go
@@ -23,12 +23,12 @@ func r(i, b, l pp.Integer) request {
 	return request{i, chunkSpec{b, l}}
 }
 
-// Check the given Request is correct for various torrent offsets.
+// Check the given request is correct for various torrent offsets.
 func TestTorrentRequest(t *testing.T) {
 	const s = 472183431 // Length of torrent.
 	for _, _case := range []struct {
 		off int64   // An offset into the torrent.
-		req request // The expected Request. The zero value means !ok.
+		req request // The expected request. The zero value means !ok.
 	}{
 		// Invalid offset.
 		{-1, request{}},
diff --git a/web_seed.go b/web_seed.go
index 297a817f..72bda5fd 100644
--- a/web_seed.go
+++ b/web_seed.go
@@ -32,22 +32,22 @@ type webSeed struct {
 	peer     peer
 }
 
-var _ PeerImpl = (*webSeed)(nil)
+var _ peerImpl = (*webSeed)(nil)
 
 func (ws *webSeed) onGotInfo(info *metainfo.Info) {
 	ws.client.FileIndex = segments.NewIndex(common.LengthIterFromUpvertedFiles(info.UpvertedFiles()))
 	ws.client.Info = info
 }
 
-func (ws *webSeed) PostCancel(r request) {
-	ws.Cancel(r)
+func (ws *webSeed) _postCancel(r request) {
+	ws.cancel(r)
 }
 
-func (ws *webSeed) WriteInterested(interested bool) bool {
+func (ws *webSeed) writeInterested(interested bool) bool {
 	return true
 }
 
-func (ws *webSeed) Cancel(r request) bool {
+func (ws *webSeed) cancel(r request) bool {
 	ws.requests[r].Cancel()
 	return true
 }
@@ -56,25 +56,25 @@ func (ws *webSeed) intoSpec(r request) webseed.RequestSpec {
 	return webseed.RequestSpec{ws.peer.t.requestOffset(r), int64(r.Length)}
 }
 
-func (ws *webSeed) Request(r request) bool {
+func (ws *webSeed) request(r request) bool {
 	webseedRequest := ws.client.NewRequest(ws.intoSpec(r))
 	ws.requests[r] = webseedRequest
 	go ws.requestResultHandler(r, webseedRequest)
 	return true
 }
 
-func (ws *webSeed) ConnectionFlags() string {
+func (ws *webSeed) connectionFlags() string {
 	return "WS"
 }
 
-func (ws *webSeed) Drop() {
+func (ws *webSeed) drop() {
 }
 
-func (ws *webSeed) UpdateRequests() {
+func (ws *webSeed) updateRequests() {
 	ws.peer.doRequestState()
 }
 
-func (ws *webSeed) Close() {}
+func (ws *webSeed) _close() {}
 
 func (ws *webSeed) requestResultHandler(r request, webseedRequest webseed.Request) {
 	result := <-webseedRequest.Result