Ask custom object exporter for representation before consulting recursion context

src/Exporter.php

@@ -518,6 +518,15 @@ final readonly class Exporter
 
     private function exportObject(object $value, RecursionContext $processed, int $indentation): string
     {
+        // A custom object exporter is responsible for the entire
+        // representation of the object it handles. Therefore, it is asked for
+        // that representation before the recursion context is consulted: every
+        // occurrence of such an object is exported the same way instead of
+        // repeated occurrences being replaced with a reference to the object.
+        if ($this->objectExporter !== null && $this->objectExporter->handles($value)) {
+            return $this->objectExporter->export($value, $this, $indentation);
+        }
+
         $class = $value::class;
 
         if ($processed->contains($value) !== false) {
@@ -526,10 +535,6 @@ final readonly class Exporter
 
         $processed->add($value);
 
-        if ($this->objectExporter !== null && $this->objectExporter->handles($value)) {
-            return $this->objectExporter->export($value, $this, $indentation);
-        }
-
         $array  = $this->toArray($value);
         $buffer = '';
 

tests/ExporterTest.php

@@ -716,7 +716,7 @@ EOT,
         );
     }
 
-    public function testObjectHandledByCustomObjectExporterIsOnlyExportedOnce(): void
+    public function testEveryOccurrenceOfObjectHandledByCustomObjectExporterIsExportedByThatObjectExporter(): void
     {
         $exporter = new Exporter(
             0,
@@ -730,10 +730,35 @@ EOT,
 
         $object = new stdClass;
 
-        $this->assertStringMatchesFormat(
+        $this->assertSame(
             <<<'EOT'
 Array &0 [
     0 => stdClass (indentation: 1),
+    1 => stdClass (indentation: 1),
+]
+EOT,
+            $exporter->export([$object, $object]),
+        );
+    }
+
+    public function testRepeatedOccurrenceOfObjectNotHandledByCustomObjectExporterIsReplacedWithReferenceToObject(): void
+    {
+        $exporter = new Exporter(
+            0,
+            40,
+            new ObjectExporterChain(
+                [
+                    new ObjectExporterThatHandlesNoObject,
+                ],
+            ),
+        );
+
+        $object = new stdClass;
+
+        $this->assertStringMatchesFormat(
+            <<<'EOT'
+Array &0 [
+    0 => stdClass Object #%d (),
     1 => stdClass Object #%d,
 ]
 EOT,