Symfony version(s) affected

7.*

Description

ChainAdapter accepts list ofCacheItemPoolInterface.
It makes me assuming that I can use it together with eitherAdapterInterface or any external class implementingCacheItemPoolInterface.
If I got it correct, I can do such thing in my DI asCacheItemPoolInterface:

newChainAdapter(  adapters: [new \Symfony\Component\Cache\Adapter\ArrayAdapter(storeSerialized:false),    YiiHelper::get(\Yii2Extended\Yii2Cache\Psr6ToYii2Cache::class),// it implements CacheItemPoolInterface  ],);

But I can't. It leads to the TypeError (see below in Additonal context).

How to reproduce

I've created a minimal script to reproduce. it's attached.
reproducer.php.txt

Here's the text of the script, if that's more convenient.

<?phprequire_once__DIR__ .'/vendor/autoload.php';useSymfony\Component\Cache\Adapter\ChainAdapter;useYii2Extended\Yii2Cache\Psr6ToYii2Cache;$chainAdapter =newChainAdapter(    adapters: [new \Symfony\Component\Cache\Adapter\ArrayAdapter(storeSerialized:false),newPsr6ToYii2Cache(new \yii\caching\ArrayCache()),    ],);$cacheKey ='foo';$item =$chainAdapter->getItem($cacheKey);if ($item->isHit()) {echo'isHit',"\n";echo$item->get(),"\n";}$item->set('bar');echo'before save',"\n";$chainAdapter->save($item);echo'after save',"\n";

In place of thePsr6ToYii2Cache can be any external (i.e., not implementing the\Symfony\Component\Cache\Adapter\AdapterInterface) class that implements theCacheItemPoolInterface.

Possible Solution

I've fixed it locally by such fix:
vendor/symfony/cache/CacheItem.php

- protected ?ItemInterface$innerItem =null;+ protected ?\Psr\Cache\CacheItemInterface$innerItem = null;

In my view it's adequate: as long asChainAdapter acceptsCacheItemPoolInterface, it's normal thatinnerItem should be ofCacheItemInterface.

Additional Context

reproducer.php without fix leads to such error message:

PHP Fatal error: Uncaught TypeError: Cannot assign Yii2Extended\Yii2Cache\Psr6ToYii2CacheItem to property Symfony\Component\Cache\CacheItem::$innerItem of type ?Symfony\Contracts\Cache\ItemInterface in /code/vendor/symfony/cache/Adapter/ProxyAdapter.php:60