You continue to miss the point here.

• You cannot control how they ask it.
• You cannot presume what context they are using.
• You cannot even presume that they are perfect in constructing the question even if you could know the context.

You can theorize all you want. In practice, I've heard "NULL string" mean all of the things I've listed, whether that was right, wrong, or even possible! And learning to deal with that ambiguity makes me a better answerer.

-- Randal L. Schwartz, Perl hacker

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