Sometimes the functionality of a library or set of classes that you’re working with is 99% perfect for the job, but the last 1% requires modification of some of the core assumptions made in the code. Altering code can cause maintenance frustrations down the track and extending code can cause maintenance frustration right away, but Ruby provides us with a flexible way to modify code with less damage. In converting to Ruby I realized how strict PHP is in its class hierarchy.
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RubySource: Confessions of a Converted PHP Developer: Animal Abuse