chore: fix rake eager loading for polymorphic type inference

Author: mattkhan

spec/example/config/application.rb

@@ -22,6 +22,7 @@ module Example
   class Application < Rails::Application
     # Initialize configuration defaults for originally generated Rails version.
     config.load_defaults 7.1
+    config.rake_eager_load = true
 
     # Please, add to the `ignore` list any other `lib` subdirectories that do
     # not contain `.rb` files, or that should not be reloaded or eager loaded.