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diff --git a/deps/v8/test/mjsunit/regress/regress-1409058.js b/deps/v8/test/mjsunit/regress/regress-1409058.js
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index 0000000000..e9351b1723
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+++ b/deps/v8/test/mjsunit/regress/regress-1409058.js
@@ -0,0 +1,9 @@
+// Copyright 2023 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+for (const invalidLocale of ["", "1", "12", "123", "1234"]) {
+ print(invalidLocale);
+ assertThrows(() => "".toLocaleUpperCase(invalidLocale), RangeError);
+ assertThrows(() => "".toLocaleLowerCase(invalidLocale), RangeError);
+}