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Re:What can't rails do? When is it the right language? by SteveC on Wednesday March 26, 2008 @12:50AM (#146551)
They used edge rails so they could write about it before it was officially released. Here's an excerpt from the book:

"However, edge Rails still comes in handy sometimes. For example, it allowed us to extensively cover Rails 2.0 features in this book prior to the actual, official 2.0 release"

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