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covariance - Why aren't there many discussions about co- and contra-variance in Haskell (as opposed to Scala or C#)?
    I know what covariance and contravariance of types are. My question is why haven't I encountered discussion of these ... enough Haskell yet :-) See Question&Answers more detail:os...
asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)
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