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Quoth Coda Highland <>, on 2013-02-14 14:54:02 -0800:
> There's no difference. nil means no value. In terms of Lua code,
> failing to return anything means that the function is treated as
> returning nil.

This is not true in general, though it's true much of the time.
In a context that expects exactly one value, such as __index
return values, returning nothing gets adjusted to a single nil.
So they are the same in this case.

   ---> Drake Wilson