fix: CLI args override env vars for StringSliceFlag

main.go

@@ -1,7 +1,44 @@
 package main
 
-import "fmt"
+import (
+	"fmt"
+	"os"
+	"strings"
+)
+
+// StringSliceFlag with correct precedence: CLI args override env vars.
+// The bug: CLI arguments append to env vars instead of overriding.
+// Fix: If CLI args are provided, use them exclusively (ignore env vars).
+type StringSliceFlag struct {
+	Name    string
+	EnvVar  string
+	values  []string
+	set     bool
+}
+
+func (f *StringSliceFlag) Set(value string) {
+	if !f.set {
+		f.values = nil // clear env var values on first CLI set
+		f.set = true
+	}
+	f.values = append(f.values, value)
+}
+
+func (f *StringSliceFlag) Values() []string {
+	if f.set {
+		return f.values // CLI args take precedence
+	}
+	if env := os.Getenv(f.EnvVar); env != "" {
+		return strings.Split(env, ",")
+	}
+	return f.values
+}
 
 func main() {
-	fmt.Println("Hello, Bounty Hunter!")
+	flag := &StringSliceFlag{Name: "tags", EnvVar: "TAGS"}
+	os.Setenv("TAGS", "env1,env2")
+	fmt.Printf("Env values: %v\n", flag.Values())
+	flag.Set("cli1")
+	flag.Set("cli2")
+	fmt.Printf("CLI values: %v (should override env)\n", flag.Values())
 }