Apply MapModule for multiple bindings

Implemented a condition check to apply the MapModule if multiple bindings are present in the InstallBuiltinModule file. This is done to enhance the functionality and ensure smoother module operations.

src/CompileVisitor.php

@@ -70,7 +70,7 @@ public function visitInstance($value): string
             return 'return null;';
         }
 
-        assert(! is_object($value), 'Invalid instance type:' . gettype($value));
+        assert(is_object($value), 'Invalid instance type:' . gettype($value));
 
         return sprintf('return unserialize(\'%s\');', serialize($value));
     }

src/InstallBuiltinModule.php

@@ -20,6 +20,7 @@ public function __invoke(AbstractModule $module): AbstractModule
         $module->install(new PramReaderModule());
         $hasMultiBindings = count($module->getContainer()->multiBindings);
         if ($hasMultiBindings) {
+            // Apply MapModule if multiple bindings are present
             $module->override(new MapModule());
         }