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I''m having problems with using Rails for a financial application: the database stores financial fields as decimal, but ActiveRecord converts these to float - so I get the rounding errors you''d expect (http://www.mindprod.com/jgloss/floatingpoint.html). This has come up recently, and the recommended fix seems to be to be Tobi Luetke''s ''money'' gem (http://article.gmane.org/gmane.comp.lang.ruby.rails/46632/match=money+bigdecimal) but this won''t work for me: I''ve inherit...