There are some lessons you can only learn by supporting a code base for years and years.
The importance of: regression testing; backward compatibility; smooth, *live* upgrade; talking to users. BOTH functions AND objects.
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I'm still not sure if you really need objects ;)
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You need ad hoc polymorphism to maximize function domains. The stateful "OO" package deal is bunk, though. Pure objects, or typeclasses.
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