Feature request

Hi, when I first attempted to run phpstan analyze against doctrine/dbal, I got the following report:

Access to undefined constant PDO::PGSQL_ATTR_DISABLE_PREPARES.

Then I installed the php-pgsql package, which got rid of the error, as the constant is now defined in PDO.

Shouldn't phpstan be aware of all possible built-in constants though, even if the actual PDO driver isn't installed on the machine running the tests?

Shouldn't phpstan stub these constants?