PHPStan Error in google/cloud-recaptcha-enterprise

Start with RecaptchaEnterpriseServiceClient, Assessment::getRiskAnalysis(), and RiskAnalysis::getReasons(), then compare the returned RepeatedField behavior with the referenced protobuf-php change. Reproduce the PHPStan error using the shown request flow and determine the compatibility boundary. Done means the reported undefined-method error has an agreed, verified resolution for this deprecated package.

Since the package is deprecated, I was unsure which issue type would be appropriate, but I am submitting this as a Bug Report because a PHPStan error occurs.

Environment details

• OS: Debian GNU/Linux 12 (bookworm)
• PHP version: 8.3.22
• Package name and version: google/cloud-recaptcha-enterprise:2.1.1, google/protobuf:4.31.1

Steps to reproduce

1. Create an instance of RecaptchaEnterpriseServiceClient.
2. Create a CreateAssessmentRequest object.
3. Send the request using the client.
4. Access the RiskAnalysis of the returned Assessment and call getReasons().
5. Attempt to call getIterator() on the result of getReasons().
6. A PHPStan error occurs.

Code example

use Google\Cloud\RecaptchaEnterprise\V1\Assessment;  
use Google\Cloud\RecaptchaEnterprise\V1\Client\RecaptchaEnterpriseServiceClient;  
use Google\Cloud\RecaptchaEnterprise\V1\CreateAssessmentRequest;

// Credentials are actually passed when creating the client
$client = new RecaptchaEnterpriseServiceClient();

// Omitted: building the Assessment instance
$assessment = new Assessment();
$assessmentRequest = CreateAssessmentRequest::build($parent, $assessment);

$createdAssessment = $client->createAssessment($assessmentRequest);
$createdAssessment->getRiskAnalysis()?->getReasons()->getIterator(); // Call to an undefined method Google\Protobuf\Internal\RepeatedField::getIterator().

I’ve been following the protobuf updates and it appears this issue may be due to changes introduced here:

https://github.com/protocolbuffers/protobuf-php/commit/9a6ad10d77de8a6d3320f10bd097bed8d6021ac1#diff-f4adb7d6333d82634864e3424d178a65e8c6e413c257198fd8371622e1e0b303

I understand that this package is deprecated and things still function for now, but I wanted to report this for future compatibility and also because this causes a PHPStan error. I’d appreciate it if you could consider addressing it.