Consistently declare Object::equals argument as @Nullable

spring-web/src/main/java/org/springframework/http/DefaultHttpStatusCode.java

@@ -19,6 +19,7 @@ package org.springframework.http;
 import java.io.Serializable;
 
 import org.springframework.lang.NonNull;
+import org.springframework.lang.Nullable;
 
 /**
  * Default implementation of {@link HttpStatusCode}.
@@ -89,7 +90,7 @@ final class DefaultHttpStatusCode
 	}
 
 	@Override
-	public boolean equals(Object obj) {
+	public boolean equals(@Nullable Object obj) {
 		return (this == obj) || (obj instanceof HttpStatusCode that && this.value == that.value());
 	}
 

spring-web/src/main/java/org/springframework/http/HttpMethod.java

@@ -170,7 +170,7 @@ public final class HttpMethod implements Comparable<HttpMethod>, Serializable {
 	}
 
 	@Override
-	public boolean equals(Object obj) {
+	public boolean equals(@Nullable Object obj) {
 		return (this == obj) || (obj instanceof HttpMethod that && this.name.equals(that.name));
 	}
 

spring-web/src/main/java/org/springframework/web/cors/CorsConfiguration.java

@@ -743,7 +743,7 @@ public class CorsConfiguration {
 		}
 
 		@Override
-		public boolean equals(Object other) {
+		public boolean equals(@Nullable Object other) {
 			if (this == other) {
 				return true;
 			}