Description

The trigger_deprecation provided by symfony/deprecation-contracts is registered in the global namespace. I really don't think it's a good practice to register functions in the global namespace for a variety of reasons, neither is there any drawbacks not to.

Would you be open to this change?

Alternatively it would also not be a bad idea to provide a static function instead as function autoloading in PHP is a bit meh:

Symfony\Deprecation::trigger(...)