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Problem solved :-)
(I wasn’t sure whether _ENV might be special ... thanks)

On Jul 5, 2018, at 2:01 PM, Luiz Henrique de Figueiredo <> wrote:

>> One could imagine a mechanism where tables get locked - new keys are not allowed to be added to locked tables, but existing keys could be used in the usual way[
> Just set a __newindex metamethod for _ENV that raises an error.