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>> Just found out that the __index metamethod is called for x=a[nil], but
>> __newindex is not called for a[nil]=x -- instead the operation is
>> specifically forbidden. I'd rather have it called too and not throw an
>> error. What am I missing?
> nil is not a valid table key.  That's all!

Then shouldn't access to a[nil] be forbidden too? Not that I'd like it
any better. What's the logic behind this limitation though?