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    Please do not link to this article on Reddit or Hacker News.

    Well, good thing we’re not Reddit or HN!

    On a more serious note, I wonder why he says that.

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      I came here to ask the same question. Presumably because they want you to use their comment system to discuss it? But how will you find the article if it’s not linked where someone will find it?

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        HN and Reddit can be pretty toxic, it might just be that the author doesn’t want to deal with that.

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          I never got into HN, but yeah, Reddit can get pretty awful.

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          Two other explanations based on previous comments people made on HN after their stuff hit front page:

          1. They dont want a work in progress to be seen by that large a crowd of technical and business people yet. A lot of negatives can come from it.

          2. They don’t want their site taken down by the HN Hug of Death. As HN reads it, nobody else can unless they think to hit Wayback. I dont recall if it happens to Medium articles.

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        Two other nice posts on covariance and contravariance:

        And a few more submissions.

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          But there’s also TypeScript which has bivariant inputs and outputs which will never warn you.

          As of TypeScript 2.6, inputs are checked contravariantly in strict mode: https://www.typescriptlang.org/docs/handbook/release-notes/typescript-2-6.html