Consistently declare Object::equals argument as @Nullable

spring-webmvc/src/test/java/org/springframework/web/servlet/tags/form/ItemPet.java

@@ -18,6 +18,8 @@ package org.springframework.web.servlet.tags.form;
 
 import java.beans.PropertyEditorSupport;
 
+import org.springframework.lang.Nullable;
+
 /**
  * @author Juergen Hoeller
  */
@@ -42,7 +44,7 @@ public class ItemPet {
 	}
 
 	@Override
-	public boolean equals(Object other) {
+	public boolean equals(@Nullable Object other) {
 		if (this == other) {
 			return true;
 		}

spring-webmvc/src/test/java/org/springframework/web/servlet/tags/form/OptionTagTests.java

@@ -29,6 +29,7 @@ import org.junit.jupiter.api.Test;
 import org.springframework.beans.propertyeditors.StringArrayPropertyEditor;
 import org.springframework.beans.testfixture.beans.Colour;
 import org.springframework.beans.testfixture.beans.TestBean;
+import org.springframework.lang.Nullable;
 import org.springframework.util.StringUtils;
 import org.springframework.validation.BeanPropertyBindingResult;
 import org.springframework.web.servlet.support.BindStatus;
@@ -555,7 +556,7 @@ class OptionTagTests extends AbstractHtmlElementTagTests {
 		}
 
 		@Override
-		public boolean equals(Object obj) {
+		public boolean equals(@Nullable Object obj) {
 			if (obj instanceof RulesVariant other) {
 				return this.toId().equals(other.toId());
 			}