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?

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

It means the latest Rails. The newest :)

The newest one.

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

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!