What is Edge Rails?

What does "Edge Rails" mean? I found some hints on the interweb, but it's not clear, does it mean the l开发者_StackOverflow社区atest Rails or Rails 2.2 or what?

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Edge rails is the Rails master branch. It means everything up to the very newest commit.

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It means the latest Rails. The newest :)

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The newest one.

Edge rails may contain lots of bugs, so use it carefully.

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It's the latest rails commit and everything in this commit is very much new and its not guaranteed to be stable! Its a funride and someone might enjoy and someone might not!