avoid using Reflection for some classes

if a class has problems with Reflection, then fall back to the old toArray
method of counting its properties. For example, using reflection on an ext-protobuf
Message causes a segfault

src/Exporter.php

@@ -33,6 +33,7 @@
 use function strtr;
 use function var_export;
 use BackedEnum;
+use Google\Protobuf\Internal\Message;
 use ReflectionObject;
 use SebastianBergmann\RecursionContext\Context as RecursionContext;
 use SplObjectStorage;
@@ -129,7 +130,9 @@ public function shortenedExport(mixed $value): string
         }
 
         if (is_object($value)) {
-            $numberOfProperties = count((new ReflectionObject($value))->getProperties());
+            $numberOfProperties = $this->cannotUseReflection($value)
+                ? count($this->toArray($value))
+                : count((new ReflectionObject($value))->getProperties());
 
             return sprintf(
                 '%s Object (%s)',
@@ -393,4 +396,9 @@ private function exportObject(object $value, RecursionContext $processed, int $i
 
         return $class . ' Object #' . spl_object_id($value) . ' (' . $buffer . ')';
     }
+
+    private function cannotUseReflection(object $object): bool
+    {
+        return $object instanceof Message;
+    }
 }