I ignore them, but it would depend on your project and your own habits. If there are others working on the project you may want to put it under version control in case someone decides to change something in rails. For me, any hacks I do to activerecord or whatnot are put in a separate library so I'm never actually touching any of the rails code. So there are times when it could be useful, but you'll have to use your own judgment.
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