Rails 3.0 is going to fully support Ruby 1.9. It’s a good thing, too, since 1.9 is much faster and has some important improvements. What that means is that, eventually, if not now, you’ll want to at least make sure your code runs in 1.9. A while back, I went through the differences between 1.8 and 1.9 with an eye for forward compatibility issues. I’ve picked out what I think the major gotchas are. Avoid these in your code and it should make moving to 1.9 a lot easier.

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