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Seriously, I have no idea what null is for - null characters, null processes, errors, null strings, nil, nada, nothing, blank, empty?
I really don't see the point of null when it's not specific enough to determine what is null. Maybe a retag is in order?
I don't know who did most of the retagging, but I just nulled the null tag from the last six questions that had it.
RIP null: 2010-2016.