At what point in your life did you realise you were no longer a child but rather an adult? Donning a suit for the first time? Or being obliged to make and pay rent, month after month? The web application developer equivalent of all this growing up is….don’t get your hopes up…accounting.

This article sums up six years of experience incrementally adding accounting features to a Rails web application—you'll learn about rounding algorithms, floating point contagion, oddball financial transactions, and more.