Is this effort still maintained? It appears to have no stable releases, just alphas, but Packagist reports a whole crapload of dependent packages and millions of installs. I'm not sure what to make of that. The most recent alpha tag also doesn't list PHP 8 compatibility, but master does.

Context: I am investigating possible queue solutions for TYPO3 and this is one I am considering. But if it's not actively maintained and PHP 8.1-friendly then it's not really an option for us.