There are no "pure" supersets: a subset within a superset is qualitatively different from the same set on its own
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More tangibly: There are no truly zero-cost abstractions. Adding new features to a language always qualitatively changes what it's like to program in that language, even if you don't use the new feature.
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they changed it and now it sucks
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Ha, yeah, usually, but sometimes the superset comes first, e.g. Facebook ⊃ Twitter
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