I don't understand this trend of hiding data in OOP, data is what computation is all about?!
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Hiding is nice because that way do don't end up accidentally depending on internal implementation stuff, which could make it harder to change stuff down the line. ML modules and abstract datatypes are also great approaches to this!
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But yeah, the big issue in OOP is the stuff you are hiding is also mutable, and it's very hard to understand what's going on, and you can lose track of it, because it's hidden. That's frustrating!