Locale-agnostic case conversions by default #KT-43023

libraries/stdlib/test/collections/ArraysTest.kt

@@ -1369,7 +1369,7 @@ class ArraysTest {
         assertEquals(mapOf("Alice" to 5, "Bob" to 3, "Carol" to 5), itemsWithTheirLength)
 
         val updatedLength = items.copyOfRange(1, 3)
-            .associateWithTo(itemsWithTheirLength.toMutableMap()) { name -> name.toLowerCase().count { it in "aeuio" } }
+            .associateWithTo(itemsWithTheirLength.toMutableMap()) { name -> name.lowercase().count { it in "aeuio" } }
 
         assertEquals(mapOf("Alice" to 5, "Bob" to 1, "Carol" to 2), updatedLength)
     }