refactor: replace Split in loops with more efficient SplitSeq

internal/cmdtest/test_cmd.go

@@ -225,8 +225,8 @@ type testlogger struct {
 }
 
 func (tl *testlogger) Write(b []byte) (n int, err error) {
-	lines := bytes.Split(b, []byte("\n"))
-	for _, line := range lines {
+	lines := bytes.SplitSeq(b, []byte("\n"))
+	for line := range lines {
 		if len(line) > 0 {
 			tl.t.Logf("(stderr) %s", line)
 		}

log/handler_glog.go

@@ -86,7 +86,7 @@ func (h *GlogHandler) Verbosity(level slog.Level) {
 //	 sets V to 3 in all files of any packages whose import path contains "foo"
 func (h *GlogHandler) Vmodule(ruleset string) error {
 	var filter []pattern
-	for _, rule := range strings.Split(ruleset, ",") {
+	for rule := range strings.SplitSeq(ruleset, ",") {
 		// Empty strings such as from a trailing comma can be ignored
 		if len(rule) == 0 {
 			continue
@@ -113,7 +113,7 @@ func (h *GlogHandler) Vmodule(ruleset string) error {
 		}
 		// Compile the rule pattern into a regular expression
 		matcher := ".*"
-		for _, comp := range strings.Split(parts[0], "/") {
+		for comp := range strings.SplitSeq(parts[0], "/") {
 			if comp == "*" {
 				matcher += "(/.*)?"
 			} else if comp != "" {

p2p/dnsdisc/tree.go

@@ -366,7 +366,7 @@ func parseBranch(e string) (entry, error) {
 		return &branchEntry{}, nil // empty entry is OK
 	}
 	hashes := make([]string, 0, strings.Count(e, ","))
-	for _, c := range strings.Split(e, ",") {
+	for c := range strings.SplitSeq(e, ",") {
 		if !isValidHash(c) {
 			return nil, entryError{"branch", errInvalidChild}
 		}

rlp/internal/rlpstruct/rlpstruct.go

@@ -148,7 +148,7 @@ func parseTag(field Field, lastPublic int) (Tags, error) {
 	name := field.Name
 	tag := reflect.StructTag(field.Tag)
 	var ts Tags
-	for _, t := range strings.Split(tag.Get("rlp"), ",") {
+	for t := range strings.SplitSeq(tag.Get("rlp"), ",") {
 		switch t = strings.TrimSpace(t); t {
 		case "":
 			// empty tag is allowed for some reason

rpc/server_test.go

@@ -92,7 +92,7 @@ func runTestScript(t *testing.T, file string) {
 	defer clientConn.Close()
 	go server.ServeCodec(NewCodec(serverConn), 0)
 	readbuf := bufio.NewReader(clientConn)
-	for _, line := range strings.Split(string(content), "\n") {
+	for line := range strings.SplitSeq(string(content), "\n") {
 		line = strings.TrimSpace(line)
 		switch {
 		case len(line) == 0 || strings.HasPrefix(line, "//"):