LibJS: Set approximate number range format result's "source" to "shared"

This is a normative change in the Intl.NumberFormat v3 spec. See:
https://github.com/tc39/proposal-intl-numberformat-v3/commit/7510e7f

1 files changed, 15 insertions, 4 deletions

diff --git a/Userland/Libraries/LibJS/Runtime/Intl/NumberFormat.cpp b/Userland/Libraries/LibJS/Runtime/Intl/NumberFormat.cpp
index f7879d8491..d955a6fcfd 100644
--- a/Userland/Libraries/LibJS/Runtime/Intl/NumberFormat.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Intl/NumberFormat.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2021-2022, Tim Flynn <trflynn89@serenityos.org>
+ * Copyright (c) 2021-2023, Tim Flynn <trflynn89@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -1744,9 +1744,20 @@ ThrowCompletionOr<Vector<PatternPartitionWithSource>> partition_number_range_pat
     auto raw_end_result = partition_number_pattern(vm, number_format, move(end));
     auto end_result = PatternPartitionWithSource::create_from_parent_list(move(raw_end_result));
 
-    // 5. If xResult is equal to yResult, return FormatApproximately(numberFormat, xResult).
-    if (start_result == end_result)
-        return format_approximately(number_format, move(start_result));
+    // 5. If xResult is equal to yResult, then
+    if (start_result == end_result) {
+        // a. Let appxResult be ? FormatApproximately(numberFormat, xResult).
+        auto approximate_result = format_approximately(number_format, move(start_result));
+
+        // b. For each r in appxResult, do
+        for (auto& result : approximate_result) {
+            // i. Set r.[[Source]] to "shared".
+            result.source = "shared"sv;
+        }
+
+        // c. Return appxResult.
+        return approximate_result;
+    }
 
     // 6. For each r in xResult, do
     for (auto& part : start_result) {