TBH, code (even when all you can do is just looking at it and understanding how it works) is probably the most useful thing to the reviewers themselves. Imagin

TBH, code (even when all you can do is just looking at it and understanding how it works) is probably the most useful thing to the reviewers themselves. Imagine the equivalent for reviewing an experimental paper, if you were given a free instant travel to the place where they did the experiment and you could look at their setup and tinker with it and see how it works. I guarantee you a lot of reviewers would go for that.