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Really nice overview of how that stuff works, but I couldn't understand what it actually does, and "how" without "what" isn't that clear an useful, really.

I felt the same way, and all my questions were answered by reading the previous article that describes the original setup. I guess the author assumed everyone had read that one.

Thanks for the feedback. I've updated the intro with better background information (the same paragraph from the previous article, in fact).

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