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Okay, that's what sets what was classically known as "object-oriented" apart.

Understandably, language evolves. If OO means something different today, what do most programmers call what used to be known as OO? I honestly have never heard anyone use anything else. But I am always up for refreshing my lexicon. What did most programmers settle on for this in order to free up OO for other uses?

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Then what does it mean if "composition over inheritance" is also taught as a good practice in OO?
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That's a rule-of-thumb to help beginners in making judgement calls. It doesn't mean inheritance should never be used.
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True, but if the defining feature of something is a feature you should use sparingly, doesn't that mean other features are more definitive?
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