装备传承：旧装备属性过继新装备

-- 错误：只加新不减旧，属性双份叠加
setplayvar(p, "enh_" .. newId,
    (getplayvar(p, "enh_" .. oldId) or 0))

local RATE = 0.8
local function inherit(p, oldId, newId)
    local oldLv = getplayvar(p, "enh_" .. oldId) or 0
    if oldLv < 1 then
        sendmsg(p, 1, "旧装备无强化可传承")
        return
    end
    if (getplayvar(p, "stone") or 0) < 1 then
        sendmsg(p, 1, "传承石不足")
        return
    end
    setplayvar(p, "stone", getplayvar(p, "stone") - 1)
    setplayvar(p, "enh_" .. newId,
        math.floor(oldLv * RATE))
    setplayvar(p, "enh_" .. oldId, 0)
    destroyEquip(p, oldId)
    sendmsg(p, 1, "传承完成，强化已过继")
end