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Read only tables.

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Goodday,
I've got this table I want to protect (a lua script as plugin) and that's coming along quite nice.
function ronly(t,i) error("Protected table!",4) end
function ronly_set() setmetatable(__tMemory,{__index=_G,__newindex=ronly});end
Now my question is, how can I change it back and forth from readonly to editable?
Thanks, Bas gr.

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