Bug Report

If a file has been cached with a different config/ruleset, it will still pass when the ruleset changes even though the file should not pass.

Minimal PHP Code Causing Issue

See https://getrector.com/demo/da1a6029-6842-4ddb-a7fd-1be936e2cc80

Using this example file:

<?php

final class DemoFile
{
    public function run()
    {
        return array();
    }
}

and this config:

<?php

use Rector\Config\RectorConfig;
use Rector\Set\ValueObject\LevelSetList;
use Rector\Php54\Rector\Array_\LongArrayToShortArrayRector;

return static function (RectorConfig $rectorConfig): void {
    $rectorConfig->sets([
        LevelSetList::UP_TO_PHP_53,
    ]);
};

1. Run with the given config - ensure cache is created
2. Change config to be UP_TO_PHP_54
3. Re-run
4. Notice no files changed
5. Re-run with --cache-clear
6. Notice 1 files changed

Expected Behaviour

All cache should be invalidated upon config change.

PHPStan also invalidates cache on any config change and more https://phpstan.org/user-guide/result-cache