local __meta = {
    balances = {},
    payments = {},
    alls = {}
}

local david;

local mt = {
    __index = function(table, key)
        return "dynamic value for " .. key
    end,
    __newindex = function(table, key, value)
        error(key .. " is a read only property")
    end
}

setmetatable(__meta.balances, mt)
setmetatable(__meta.payments, mt)

local globalMeta = {
    __index = function(table, key)
        print("Accessing undefined key:", key)
        if key == "balances" then
            return __meta.balances
        elseif key == "payments" then
            return __meta.payments
        end
        return __meta.alls[key]
    end,
    __newindex = function(table, key, value)
        print("set " .. key .. " dynamically to " .. value)
        __meta.alls[key] = value
    end
}

setmetatable(_G, globalMeta)

-- Accessing existing keys
print(balances.key1) -- Output: value1
print(balances.key2) -- Output: value2

-- balances.key1 = "value 1"

-- Accessing undefined key
print(balances.key3)
print("xxx")
print(payments.key3)


print("v => " .. cesar)
print("v => " .. david)