rename startSN and endSN for clarity

pkg/twcc/twcc.go

@@ -109,18 +109,18 @@ func (r *Recorder) BuildFeedbackPacket() []rtcp.Packet {
 func (r *Recorder) maybeBuildFeedbackPacket(beginSeqNumInclusive, endSeqNumExclusive int64) *feedback {
 	// NOTE: The logic of this method is inspired by the implementation in Chrome.
 	// See https://source.chromium.org/chromium/chromium/src/+/refs/heads/main:third_party/webrtc/modules/remote_bitrate_estimator/remote_estimator_proxy.cc;l=276;drc=b5cd13bb6d5d157a5fbe3628b2dd1c1e106203c6
-	startSN, endSN := r.arrivalTimeMap.Clamp(beginSeqNumInclusive), r.arrivalTimeMap.Clamp(endSeqNumExclusive)
+	startSNInclusive, endSNExclusive := r.arrivalTimeMap.Clamp(beginSeqNumInclusive), r.arrivalTimeMap.Clamp(endSeqNumExclusive)
 
 	// Create feedback on demand, as we don't yet know if there are packets in the range that have been
 	// received.
 	var fb *feedback
 
 	nextSequenceNumber := beginSeqNumInclusive
 
-	for seq := startSN; seq < endSN; seq++ {
+	for seq := startSNInclusive; seq < endSNExclusive; seq++ {
 		foundSeq, arrivalTime, ok := r.arrivalTimeMap.FindNextAtOrAfter(seq)
 		seq = foundSeq
-		if !ok || seq >= endSN {
+		if !ok || seq >= endSNExclusive {
 			break
 		}