rewrite expand

internal/statsapi/feed.go

@@ -37,8 +37,14 @@ type about struct {
 }
 
 func expand(arr []any, idx int) []any {
-	front := append(arr[:idx], nil)
-	all := append(front, arr[idx:])
+	var all []any
+	if idx < len(arr) {
+		all = arr
+	} else {
+		all = make([]any, idx+1)
+		copy(all[:len(arr)], arr)
+		all[idx] = make(map[string]any)
+	}
 	return all
 }