Locale-agnostic case conversions by default #KT-43023

libraries/stdlib/test/collections/CollectionTest.kt

@@ -489,7 +489,7 @@ class CollectionTest {
         assertEquals(mapOf("Alice" to 5, "Bob" to 3, "Carol" to 5), itemsWithTheirLength)
 
         val updatedLength =
-            items.drop(1).associateWithTo(itemsWithTheirLength.toMutableMap()) { name -> name.toLowerCase().count { it in "aeuio" }}
+            items.drop(1).associateWithTo(itemsWithTheirLength.toMutableMap()) { name -> name.lowercase().count { it in "aeuio" }}
 
         assertEquals(mapOf("Alice" to 5, "Bob" to 1, "Carol" to 2), updatedLength)
     }
@@ -1099,7 +1099,7 @@ class CollectionTest {
     }
 
     @Test fun sortedWith() {
-        val comparator = compareBy<String> { it.toUpperCase().reversed() }
+        val comparator = compareBy<String> { it.uppercase().reversed() }
         val data = listOf("cat", "dad", "BAD")
 
         expect(listOf("BAD", "dad", "cat")) { data.sortedWith(comparator) }