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Currently, if a "return" is given outside of a function, we'd just throw an error. That always struck me as a bit weird, given that scripts can also return a value. So simply let "return" outside also exit the script, kinda like "exit" does. However, unlike "exit" it doesn't quit an interactive shell - it seems weird to have "return" do that as well. It sets $status, so it can be used to quickly set that, in case you want to test something.