`FilesystemMap` should specify `\IteratorAggregate<TKey, TValue>`

[mvhirsch]

After injecting FilesystemMap into one of my services, PHPStan reports an error:

final class MyClass
{
    public function __construct(FilesystemMap $filesystemMap) 
    {
         // ...
    }
   
    // ...
}

Method MyClass::__construct() has parameter $filesystemMap with no value type specified in iterable type Knp\Bundle\GaufretteBundle\FilesystemMap.

A quick look at FilesystemMap revealed: it's implementing \IteratorAggregate but do not specify it's values.

I do think this is enough, but currently unable to test it:

/**
 * @implements \IteratorAggregate<string, FilesystemMap>
 */
class FilesystemMap implements \IteratorAggregate, FilesystemMapInterface