Marking Uuid::uuid3() as pure as well: it produces same values for same input

src/Uuid.php

@@ -512,6 +512,9 @@ class Uuid implements UuidInterface
      *
      * @return UuidInterface A UuidInterface instance that represents a
      *     version 3 UUID
+     *
+     * @psalm-pure note: changing the internal factory is an edge case not covered by purity invariants,
+     *             but under constant factory setups, this method operates in functionally pure manners
      */
     public static function uuid3($ns, string $name): UuidInterface
     {

tests/static-analysis/UuidIsImmutable.php

@@ -90,6 +90,15 @@ final class UuidIsImmutable
         ];
     }
 
+    /** @psalm-pure */
+    public static function uuid3IsPure(): UuidInterface
+    {
+        return Uuid::uuid3(
+            Uuid::fromString('ff6f8cb0-c57d-11e1-9b21-0800200c9a66'),
+            'Look ma! I am a pure function!'
+        );
+    }
+
     /** @psalm-pure */
     public static function uuid5IsPure(): UuidInterface
     {