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    And if you're looking at two NaNs in the same place, they are "the same" but don't compare equal! Commented Sep 25, 2019 at 9:37
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    No two NULL are created equal, either!
    – bishop
    Commented Sep 25, 2019 at 12:41
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    More importantly if they are "The same" object then changing one will change the other, if they are "Equal" objects they can also be "The Same" but maybe not and changing one will not change the other, it will just make them unequal.
    – Bill K
    Commented Sep 25, 2019 at 16:12
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    @bishop Don't know if you're referencing the recent news story or computer science, but this is a very practical example of the cost of getting this "philosophical" answer wrong: "Having ‘Null’ as a license plate is about as much of a nightmare as you’d expect" theverge.com/tldr/2019/8/14/20805543/…
    – Jeff Y
    Commented Sep 25, 2019 at 17:07
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    Wow, @JeffY, I hadn't read that one. Thanks for sharing!
    – bishop
    Commented Sep 25, 2019 at 17:35