The negative hypothesis is always untestable. Rather than attempting to reason about absence directly, it is more useful to encode it in an explicit form.
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Huh. I don't think my driver's license has my phone number on it ... checks ... that's right, it doesn't.
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In either case you're in trouble if you're halfway through. So they are the same.
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I just met you and this is crazy but sometimes not having a particular thing isn't always the same as not having just any thing so call it maybe?
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Is not having an apple the same as an empty maybe-orange?
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phrased differently: don't couple the information itself with whether you know it
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Is not having a thing the same as having a null thing?
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I've got nothing to say to that.
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Do you mean undefined != none?
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I think it means (not= nil []). That's why in
#Clojure falsy values are only false and nil.
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