Add support for PHP 8.1

src/Fields/SerializableFieldsTrait.php

@@ -14,7 +14,10 @@ declare(strict_types=1);
 
 namespace Ramsey\Uuid\Fields;
 
+use ValueError;
+
 use function base64_decode;
+use function sprintf;
 use function strlen;
 
 /**
@@ -42,6 +45,14 @@ trait SerializableFieldsTrait
         return $this->getBytes();
     }
 
+    /**
+     * @return array{bytes: string}
+     */
+    public function __serialize(): array
+    {
+        return ['bytes' => $this->getBytes()];
+    }
+
     /**
      * Constructs the object from a serialized string representation
      *
@@ -58,4 +69,16 @@ trait SerializableFieldsTrait
             $this->__construct(base64_decode($serialized));
         }
     }
+
+    /**
+     * @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']);
+    }
 }