Support conversion from primitive array to Object[] in ConversionService

Prior to this commit, the ConversionService failed to convert a primitive
array (such as int[]) to an Object[] due to an error in the logic in
ArrayToArrayConverter.

This commit addresses this by augmenting the "can bypass conversion"
check in ArrayToArrayConverter to ensure that the supplied source object
is an instance of the target type (i.e., that the source array can be
cast to the target type array without conversion).

Closes gh-33212

Author: sbrannen

spring-core/src/main/java/org/springframework/core/convert/support/ArrayToArrayConverter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -34,6 +34,7 @@
  *
  * @author Keith Donald
  * @author Phillip Webb
+ * @author Sam Brannen
  * @since 3.0
  */
 final class ArrayToArrayConverter implements ConditionalGenericConverter {
@@ -64,8 +65,8 @@ public boolean matches(TypeDescriptor sourceType, TypeDescriptor targetType) {
 	public Object convert(@Nullable Object source, TypeDescriptor sourceType, TypeDescriptor targetType) {
 		if (this.conversionService instanceof GenericConversionService genericConversionService) {
 			TypeDescriptor targetElement = targetType.getElementTypeDescriptor();
-			if (targetElement != null && genericConversionService.canBypassConvert(
-					sourceType.getElementTypeDescriptor(), targetElement)) {
+			if (targetElement != null && targetType.getType().isInstance(source) &&
+					genericConversionService.canBypassConvert(sourceType.getElementTypeDescriptor(), targetElement)) {
 				return source;
 			}
 		}

spring-core/src/test/java/org/springframework/core/convert/converter/DefaultConversionServiceTests.java

@@ -43,7 +43,6 @@
 import java.util.regex.Pattern;
 import java.util.stream.Stream;
 
-import org.junit.jupiter.api.Disabled;
 import org.junit.jupiter.api.Test;
 
 import org.springframework.core.MethodParameter;
@@ -640,8 +639,7 @@ void convertObjectArrayToIntArray() {
 		assertThat(result).containsExactly(1, 2, 3);
 	}
 
-	@Disabled("Primitive array to Object[] conversion is not currently supported")
-	@Test
+	@Test  // gh-33212
 	void convertIntArrayToObjectArray() {
 		Object[] result = conversionService.convert(new int[] {1, 2}, Object[].class);
 		assertThat(result).containsExactly(1, 2);