Lua表序列化：草稿数据的字符串往返

-- 错误：直接把表当字符串存，存进去的是地址
local text = tostring(draft)
saveDraft(text)

local function encode(t)
    local parts = {}
    for k, v in pairs(t) do
        parts[#parts + 1] = k .. "=" .. tostring(v)
    end
    return table.concat(parts, ";")
end
local function decode(s)
    local t = {}
    for pair in s:gmatch("[^;]+") do
        local k, v = pair:match("([^=]+)=(.*)")
        t[k] = v
    end
    return t
end