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On Oct 21, 2011, at 9:54 PM, Luiz Henrique de Figueiredo wrote:

>> we don't have to do a require"io" or require"table" before using them
> 
> But you *can* do the requires. So, if you feel better using them, by all
> means do it.

Not only will it make you feel better, but if you are in a closed environment (e.g. a module :), you have too. Which is a good thing :)