unknown knowns
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The concept of 'unknown knowns' is presented as a fourth and most dangerous category beyond the classic Rumsfeld framework of known knowns, known unknowns, and unknown unknowns. These are beliefs people hold without knowing why they hold them — unconscious assumptions that go unexamined. The Ruby dislike is used as a relatable entry point to illustrate how developers (and people generally) often can't explain the reasoning behind their strong technical opinions.
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