make:serializer:encoder generates invalid (untyped) class

[Radiergummi]

In Symfony 6.0, using the symfony console make:serializer:encoder command results in method stubs without parameter type hints, which conflicts with the typed interface. Thus, this will cause the application to crash due to an incompatible implementation:

Compile Error: Declaration of App\Serializer\FooEncoder::encode($data, $format, array $context = []) must be compatible with Symfony\Component\Serializer\Encoder\EncoderInterface::encode(mixed $data, string $format, array $context = []): string

This should be solvable by updating the template as follows:

<?= "<?php\n" ?>

namespace <?= $namespace; ?>;

use Symfony\Component\Serializer\Encoder\DecoderInterface;
use Symfony\Component\Serializer\Encoder\EncoderInterface;

class <?= $class_name ?> implements EncoderInterface, DecoderInterface
{
    public const FORMAT = '<?= $format ?>';

-   public function encode($data, $format, array $context = [])
+   public function encode(mixed $data, string $format, array $context = []): string
    {
        // TODO: return your encoded data
        return '';
    }

-   public function supportsEncoding($format): bool
+   public function supportsEncoding(string $format): bool
    {
        return self::FORMAT === $format;
    }

-   public function decode($data, $format, array $context = [])
+   public function decode(string $data, string $format, array $context = [])
    {
        // TODO: return your decoded data
        return '';
    }

-   public function supportsDecoding($format): bool
+   public function supportsDecoding(string $format): bool
    {
        return self::FORMAT === $format;
    }
}