[Serializer] MetadataAwareNameConverter break groups parameters

[gilles-g]

Symfony version(s) affected: 4.3.7

Description
Since #34035, cannot denormalize with that syntax ['groups' => 'user']

How to reproduce

$obj = $normalizer->denormalize(['bar' => 'Api Platform'], Foo::class, null, ['groups' => 'user']);

-->

/**
In MetadataAwareNameConverter.php line 126:
                                                                                 
Warning: array_intersect(): Expected parameter 2 to be an array, string given
*/

https://github.com/symfony/symfony/blob/master/src/Symfony/Component/Serializer/NameConverter/MetadataAwareNameConverter.php#L126

Possible Solution

@antograssiot If you could have a look at this

Additional context

[bizley]

I can confirm the same problem. Changing the groups value to array helped. Possible solution is the array cast in this line:

if ($groups && !array_intersect($groups, (array)$context[AbstractNormalizer::GROUPS] ?? [])) {

[antograssiot]

I just submitted a fix, apologies for that 😞