conn.go: Allow split packets of up to 512 fragments.

conn.go

@@ -671,7 +671,7 @@ func (conn *Conn) handleConnectionRequestAccepted(b []byte) error {
 // packet of its sequence, it will continue handling the full packet as it
 // otherwise would. An error is returned if the packet was not valid.
 func (conn *Conn) receiveSplitPacket(p *packet) error {
-	const maxSplitCount = 128
+	const maxSplitCount = 512
 	const maxConcurrentSplits = 4
 
 	if p.splitCount > maxSplitCount && conn.limits {