indexOf on sorted lists should return the first match

primitiveCollections/src/test/java/org/lucares/collections/IntListTest.java

@@ -680,6 +680,13 @@ public class IntListTest {
 		Assert.assertEquals(1, list.indexOf(2));
 	}
 
+	@Test
+	public void testIndexOfOnSortedListReturnsFirstMatch() {
+		final IntList list = IntList.of(0, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 4);
+		Assert.assertEquals(2, list.indexOf(2));
+		Assert.assertEquals(4, list.indexOf(2, 4));
+	}
+
 	@Test
 	public void testIndexOfOnUnsortedList() {
 		final IntList list = IntList.of(2, 0, 1);