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Ivan Godard
Keymaster
January 23, 2018 at 1:07 pm
Post count: 689
#3192

There is no “Null”. Perhaps you are thinking of “None”, which is a distinct meta-state and is not a NaR in the machine semantics, albeit encoded in a similar way. “None” is preserving (None+NaR->None), but also None+None is implementation dependent.