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local mt = getmetatable(_G) or {}
function mt.__index (t, k)
if k ~= 'name' and k ~= 'arg' then
error('Tried to read nil global ' .. tostring(k), 2)
end
end
function mt.__newindex(t, k, v)
if k ~= 'name' and k ~= 'arg' then
error('Tried to write global ' .. tostring(k), 2)
end