Import Cobalt 21.master.0.301323
diff --git a/src/third_party/v8/test/intl/regress-9408.js b/src/third_party/v8/test/intl/regress-9408.js
new file mode 100644
index 0000000..d5cfb11
--- /dev/null
+++ b/src/third_party/v8/test/intl/regress-9408.js
@@ -0,0 +1,27 @@
+// Copyright 2019 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.
+
+// Test precision of compact-rounding
+
+let compact = {notation: "compact"};
+assertEquals("1.2K", (1234).toLocaleString("en", compact));
+assertEquals("12K", (12345).toLocaleString("en", compact));
+assertEquals("123K", (123456).toLocaleString("en", compact));
+assertEquals("1.2M", (1234567).toLocaleString("en", compact));
+
+assertEquals("54K", (54321).toLocaleString("en", compact));
+
+let compact_no_rounding = {notation: "compact", minimumFractionDigits: 0};
+assertEquals("1.234K", (1234).toLocaleString("en", compact_no_rounding));
+assertEquals("12.345K", (12345).toLocaleString("en", compact_no_rounding));
+assertEquals("123.456K", (123456).toLocaleString("en", compact_no_rounding));
+assertEquals("1.235M", (1234567).toLocaleString("en", compact_no_rounding));
+
+assertEquals("54.321K", (54321).toLocaleString("en", compact_no_rounding));
+
+let fmt = new Intl.NumberFormat("en", compact_no_rounding);
+assertEquals("1", fmt.format(1));
+assertEquals("1K", fmt.format(1000));
+assertEquals("1.234K", fmt.format(1234));
+assertEquals("1.25K", fmt.format(1250));
