git clone https://github.com/maMykola/symfony-denormalizer-serialized-path
cd symfony-denormalizer-serialized-path
composer install
bin/console app:denormalize

[critical] Error thrown while running command "app:denormalize". Message: "Cannot read property "grid" from an array. Maybe you intended to write the property path as "[grid]" instead."

In PropertyAccessor.php line 397:
                                                                                                                 
  Cannot read property "grid" from an array. Maybe you intended to write the property path as "[grid]" instead.  
                                                                                                                 

app:denormalize

App\Model\Main {#313
  +id: 25
  +attributes: App\Model\Attributes {#5174
    +title: "Attribute"
    +columns: array:3 [
      0 => "one"
      1 => "two"
      2 => "three"
    ]
  }
}