【高级技巧】Lua双缓冲：裁决之杖库存表的整表热替换

local function tidy(actor)
    for k, v in pairs(STORE) do
        if v == 0 then STORE[k] = nil end   -- 边读边删，读者见半成品
    end
end

local function tidy(actor)
    local draft = {}
    for k, v in pairs(STORE) do
        if v > 0 then draft[k] = v end   -- 副本上整备
    end
    STORE = draft                     -- 原子换引用
    sendmsg(actor, 1, "裁决之杖库存已换新表")
end