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NewIndex

mymetatable = {}
mytable = setmetatable({key1 = "value1"}, { __newindex = mymetatable })

print(mytable.key1)

mytable.newkey = "new value 2"
print(mytable.newkey,mymetatable.newkey)

mytable.key1 = "new  value 1"
print(mytable.key1,mymetatable.newkey1)

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