Add support for PHP 8.1

src/Uuid.php

@@ -23,10 +23,12 @@ use Ramsey\Uuid\Lazy\LazyUuidFromString;
 use Ramsey\Uuid\Rfc4122\FieldsInterface as Rfc4122FieldsInterface;
 use Ramsey\Uuid\Type\Hexadecimal;
 use Ramsey\Uuid\Type\Integer as IntegerObject;
+use ValueError;
 
 use function assert;
 use function bin2hex;
 use function preg_match;
+use function sprintf;
 use function str_replace;
 use function strcmp;
 use function strlen;
@@ -289,6 +291,14 @@ class Uuid implements UuidInterface
         return $this->getFields()->getBytes();
     }
 
+    /**
+     * @return array{bytes: string}
+     */
+    public function __serialize(): array
+    {
+        return ['bytes' => $this->serialize()];
+    }
+
     /**
      * Re-constructs the object from its serialized form
      *
@@ -313,6 +323,18 @@ class Uuid implements UuidInterface
         $this->timeConverter = $uuid->timeConverter;
     }
 
+    /**
+     * @param array{bytes: string} $data
+     */
+    public function __unserialize(array $data): void
+    {
+        if (!isset($data['bytes'])) {
+            throw new ValueError(sprintf('%s(): Argument #1 ($data) is invalid', __METHOD__));
+        }
+
+        $this->unserialize($data['bytes']);
+    }
+
     public function compareTo(UuidInterface $other): int
     {
         $compare = strcmp($this->toString(), $other->toString());