Specify nullability @⁠Contract for TypeDescriptor.array()

spring-core/src/main/java/org/springframework/core/convert/TypeDescriptor.java

@@ -644,6 +644,7 @@ public class TypeDescriptor implements Serializable {
 	 * @since 3.2.1
 	 */
 	@Nullable
+	@Contract("!null -> !null; null -> null")
 	public static TypeDescriptor array(@Nullable TypeDescriptor elementTypeDescriptor) {
 		if (elementTypeDescriptor == null) {
 			return null;

spring-expression/src/main/java/org/springframework/expression/spel/support/ReflectionHelper.java

@@ -389,7 +389,6 @@ public abstract class ReflectionHelper {
 			// FunctionReference#executeFunctionViaMethodHandle().
 			Class<?> varargsComponentClass = ClassUtils.resolvePrimitiveIfNecessary(varargsArrayClass.componentType());
 			TypeDescriptor varargsArrayType = TypeDescriptor.array(TypeDescriptor.valueOf(varargsComponentClass));
-			Assert.state(varargsArrayType != null, "Array type must not be null for a varargs array");
 			TypeDescriptor varargsComponentType = varargsArrayType.getElementTypeDescriptor();
 			Assert.state(varargsComponentType != null, "Component type must not be null for a varargs array");