REE is fully compatible with the analogue of MRI (Matz's). One caveat is that REE is slowly replacing changes with MRI upstream. And don't worry, at the time of this writing, REE has combined all the changes with MRI 1.8.7-p334. Enjoy it!
I would like to see someone create the REE Debian package. If you think you have everything you need, why don't you try the packaging?
I had several servers running REE with Passenger Phusion, and they are very reliable and stable (I never fall for me). Therefore, he must answer your question if he acts funny or not.
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