Cahnge getSequence default for null

src/Database/Document.php

@@ -66,11 +66,17 @@ public function getId(): string
     }
 
     /**
-     * @return string
+     * @return string|null
      */
-    public function getSequence(): string
+    public function getSequence(): ?string
     {
-        return $this->getAttribute('$sequence', '');
+        $sequence = $this->getAttribute('$sequence');
+
+        if ($sequence === null) {
+            return null;
+        }
+
+        return $sequence;
     }
 
     /**
@@ -172,10 +178,12 @@ public function getUpdatedAt(): ?string
     public function getTenant(): ?int
     {
         $tenant = $this->getAttribute('$tenant');
-        if ($tenant !== null) {
-            return (int)$tenant;
+
+        if ($tenant === null) {
+            return null;
         }
-        return null;
+
+        return (int) $tenant;
     }
 
     /**

tests/e2e/Adapter/Scopes/DocumentTests.php

@@ -1968,9 +1968,6 @@ public function testFindByInternalID(array $data): void
         ]);
 
         $this->assertEquals(1, count($documents));
-
-        $empty = new Document();
-        $this->assertEquals('', $empty->getSequence());
     }
 
     public function testFindOrderBy(): void

tests/unit/DocumentTest.php

@@ -409,4 +409,12 @@ public function testGetArrayCopy(): void
         ], $this->document->getArrayCopy());
         $this->assertEquals([], $this->empty->getArrayCopy());
     }
+
+    public function testEmptyDocumentSequence(): void
+    {
+        $empty = new Document();
+
+        $this->assertNull($empty->getSequence());
+        $this->assertNotSame('', $empty->getSequence());
+    }
 }