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What's the difference between none inches and 0 inches? Might need a concrete example. We deal with space a fair amount and haven't needed many optionals there.



They just gave a concrete example: The difference between "we don't know" and "we know that it's zero".

Here's another fun one: I've seen APIs where "0.0" was treated as "no value, so take the default value". The default value happened to be 0.2.




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