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Comment by naasking | Hacker News Reader

Storing a null value is a legitimate operation. How do you distinguish "never stored a value under key K", and "stored null under key K"?

I'm pretty sure you're agreeing with them. Current Lua does this, which is wonky:

    > t = {}
    > t['a'] = nil
    > t['a']
    nil
    > t['b']
    nil