final protected is more better to prevent to override

Author: shmurakami

src/Enum.php

@@ -81,7 +81,7 @@ public function __toString(): string
      * @throws LogicException Enums are not cloneable
      *                        because instances are implemented as singletons
      */
-    private function __clone()
+    final protected function __clone()
     {
         throw new LogicException('Enums are not cloneable');
     }

tests/MabeEnumTest/EnumTest.php

@@ -245,7 +245,7 @@ public function testGetNamesConstantsNotDetected(): void
             $this->assertSame($expectedNames[$i], $names[$i]);
         }
     }
-    
+
     public function testGetOrdinals(): void
     {
         $constants = EnumInheritance::getConstants();
@@ -376,7 +376,8 @@ public function testCloneNotCallableAndThrowsLogicException(): void
 
         $reflectionClass  = new ReflectionClass($enum);
         $reflectionMethod = $reflectionClass->getMethod('__clone');
-        $this->assertTrue($reflectionMethod->isPrivate(), 'The method __clone must be private');
+        $this->assertTrue($reflectionMethod->isProtected(), 'The method __clone must be protected');
+        $this->assertTrue($reflectionMethod->isFinal(), 'The method __clone must be final');
 
         $reflectionMethod->setAccessible(true);
         $this->expectException(LogicException::class);
@@ -431,7 +432,7 @@ public function testConstVisibility(): void
             'PUB'  => ConstVisibilityEnum::PUB,
         ), $constants);
     }
-    
+
     public function testConstVisibilityExtended(): void
     {
         $constants = ConstVisibilityEnumExtended::getConstants();