[Uid] Unable to extend Uuid/Ulid and use fromString()

src/Symfony/Component/Uid/Tests/Fixtures/CustomUlid.php

@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Uid\Tests\Fixtures;
+
+use Symfony\Component\Uid\Ulid;
+
+final class CustomUlid extends Ulid
+{
+}

src/Symfony/Component/Uid/Tests/Fixtures/CustomUuid.php

@@ -0,0 +1,18 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Uid\Tests\Fixtures;
+
+use Symfony\Component\Uid\Uuid;
+
+final class CustomUuid extends Uuid
+{
+}

src/Symfony/Component/Uid/Tests/UlidTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\Uid\Tests;
 
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\Uid\Tests\Fixtures\CustomUlid;
 use Symfony\Component\Uid\Ulid;
 use Symfony\Component\Uid\UuidV4;
 
@@ -118,4 +119,9 @@ class UlidTest extends TestCase
         $this->assertLessThan(0, $b->compare($c));
         $this->assertGreaterThan(0, $c->compare($b));
     }
+
+    public function testFromStringOnExtendedClassReturnsStatic()
+    {
+        $this->assertInstanceOf(CustomUlid::class, CustomUlid::fromString((new CustomUlid())->toBinary()));
+    }
 }

src/Symfony/Component/Uid/Tests/UuidTest.php

@@ -13,6 +13,7 @@ namespace Symfony\Component\Uid\Tests;
 
 use PHPUnit\Framework\TestCase;
 use Symfony\Component\Uid\NilUuid;
+use Symfony\Component\Uid\Tests\Fixtures\CustomUuid;
 use Symfony\Component\Uid\Ulid;
 use Symfony\Component\Uid\Uuid;
 use Symfony\Component\Uid\UuidV1;
@@ -185,4 +186,9 @@ class UuidTest extends TestCase
         $this->assertInstanceOf(NilUuid::class, $uuid);
         $this->assertSame('00000000-0000-0000-0000-000000000000', (string) $uuid);
     }
+
+    public function testFromStringOnExtendedClassReturnsStatic()
+    {
+        $this->assertInstanceOf(CustomUuid::class, CustomUuid::fromString(self::A_UUID_V4));
+    }
 }

src/Symfony/Component/Uid/Ulid.php

@@ -79,7 +79,7 @@ class Ulid extends AbstractUid
             base_convert(substr($ulid, 27, 5), 16, 32)
         );
 
-        return new self(strtr($ulid, 'abcdefghijklmnopqrstuv', 'ABCDEFGHJKMNPQRSTVWXYZ'));
+        return new static(strtr($ulid, 'abcdefghijklmnopqrstuv', 'ABCDEFGHJKMNPQRSTVWXYZ'));
     }
 
     public function toBinary(): string