infiT

local tPath,targetT
local loopT=setmetatable({},{
__index=function(t,index)
    table.insert(tPath,index)
    return t
end,
__newindex=function(t,index,val)
    for i=1,#tPath do
        rawset(targetT,tPath[i],setmetatable({},infiMT))
        targetT=targetT[tPath[i]]
    end
    rawset(targetT,index,val)
end
})

infiMT={__index=function(t,index)
    tPath={index}
    targetT=t
    return loopT
end}

infiT=setmetatable({},infiMT)