I've noticed that when I CTRL-click on a built-in Ruby class it takes me to a stub version of the class that seems to be part of IntelliJ (installed as a plugin). For example, if I click on "alias_method" it takes me to module.rb at \.IntelliJIdea10\config\plugins\ruby\rubystubs\rubystubs18\.
I guess these stubs are used for faster indexing? Is that why it doesn't just use the code from the Ruby interpretor used by the project?
Is there any way to make CTRL-click navigate to the actual implementation instead of the stub without sacrificing performance?