phpstan-drupal 2.1.0: stricter defaults

phpstan-drupal 2.1.0 is out. The theme of this release: rules and behaviors that proved themselves as opt-ins are now the defaults. If you run `composer update` and see new errors, that is the release working as intended — everything below includes the configuration to opt back out. Nine rules are now enabled by default These rules shipped as opt-ins over the 2.0 cycle. They have had time to bake,…