diff --git a/modules/http/http.go b/modules/http/http.go
index 712beb7..10151cd 100644
--- a/modules/http/http.go
+++ b/modules/http/http.go
@@ -234,13 +234,13 @@ func handleRequest(ctx *fasthttp.RequestCtx) {
 			req.Path = path
 			req.Body = string(ctx.Request.Body())
 
-			ctx.QueryArgs().VisitAll(func(key, value []byte) {
+			for key, value := range ctx.QueryArgs().All() {
 				req.Query[string(key)] = string(value)
-			})
+			}
 
-			ctx.Request.Header.VisitAll(func(key, value []byte) {
+			for key, value := range ctx.Request.Header.All() {
 				req.Headers[string(key)] = string(value)
-			})
+			}
 
 			err := worker.HandleRequest(req, resp)
 			if err != nil {
@@ -277,8 +277,8 @@ func tryStaticHandler(ctx *fasthttp.RequestCtx, path string) bool {
 	defer staticMu.RUnlock()
 
 	for prefix, fs := range staticHandlers {
-		if strings.HasPrefix(path, prefix) {
-			ctx.Request.URI().SetPath(strings.TrimPrefix(path, prefix))
+		if after, ok := strings.CutPrefix(path, prefix); ok {
+			ctx.Request.URI().SetPath(after)
 			fs.NewRequestHandler()(ctx)
 			return true
 		}
diff --git a/modules/string/string.go b/modules/string/string.go
index 3a7824f..e8a6f27 100644
--- a/modules/string/string.go
+++ b/modules/string/string.go
@@ -30,11 +30,7 @@ func string_slice(s *luajit.State) int {
 
 	runes := []rune(str)
 	length := len(runes)
-	startIdx := start - 1 // Convert from 1-indexed
-
-	if startIdx < 0 {
-		startIdx = 0
-	}
+	startIdx := max(start-1, 0) // Convert from 1-indexed
 	if startIdx >= length {
 		s.PushString("")
 		return 1
diff --git a/state/state.go b/state/state.go
index d3f7ab3..4333c2d 100644
--- a/state/state.go
+++ b/state/state.go
@@ -259,7 +259,7 @@ func (s *State) ExecuteStringWithResults(code, name string) ([]any, error) {
 	}
 
 	results := make([]any, nresults)
-	for i := 0; i < nresults; i++ {
+	for i := range nresults {
 		val, err := s.ToValue(baseTop + i + 1)
 		if err != nil {
 			results[i] = nil
diff --git a/watcher.go b/watcher.go
index ca4271a..40f3234 100644
--- a/watcher.go
+++ b/watcher.go
@@ -3,6 +3,7 @@ package main
 import (
 	"fmt"
 	"log"
+	"maps"
 	"os"
 	"path/filepath"
 	"strings"
@@ -84,9 +85,7 @@ func (fw *FileWatcher) pollLoop() {
 func (fw *FileWatcher) checkFiles() {
 	fw.mu.RLock()
 	files := make(map[string]time.Time, len(fw.files))
-	for path, modTime := range fw.files {
-		files[path] = modTime
-	}
+	maps.Copy(files, fw.files)
 	fw.mu.RUnlock()
 
 	changed := false