Change the $node parameter from mixed to ?Hexadecimal

src/UuidFactoryInterface.php

@@ -109,8 +109,8 @@ interface UuidFactoryInterface
      * Returns a version 6 (ordered-time) UUID from a host ID, sequence number,
      * and the current time
      *
-     * @param int|string $node A 48-bit number representing the hardware address;
-     *     this number may be represented as an integer or a hexadecimal string
+     * @param Hexadecimal|null $node A 48-bit number representing the hardware
+     *     address
      * @param int $clockSeq A 14-bit number used to help avoid duplicates that
      *     could arise when the clock is set backwards in time or if the node ID
      *     changes
@@ -118,7 +118,7 @@ interface UuidFactoryInterface
      * @return UuidInterface A UuidInterface instance that represents a
      *     version 6 UUID
      */
-    public function uuid6($node = null, ?int $clockSeq = null): UuidInterface;
+    public function uuid6(?Hexadecimal $node = null, ?int $clockSeq = null): UuidInterface;
 
     /**
      * Creates a UUID from a byte string