【策划架构】Lua rawget直读：祖玛商店价目表的存取分层

PriceList = {["裁决之杖"] = 15001}
local mt = {
    __index = PriceList,
    __newindex = function(t, k, v)
        PriceList[k] = v            -- 拦截里直写本体，价目被污染
    end}
local shop = setmetatable({}, mt)

PriceList = {["裁决之杖"] = 15001}
local mt = {
    __index = PriceList,
    __newindex = function(t, k, v)
        sendmsg(getplayerbyname("GM01"), 1,
            "调价审计 " .. k .. " -> " .. v)
        rawset(t, k, v)             -- 影子留痕，本体不动
    end}
local shop = setmetatable({}, mt)
local function getPrice(name)
    return rawget(shop, name) or PriceList[name]
end