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字节码 delete 原先只清值为 undefined,属性残留在 shape 链,hasOwnProperty/ keys/枚举仍可见。统一走共享 delete_own_property(与 Reflect.deleteProperty 一致): - 命名属性经 shape 链重建移除,数组重建前保存并恢复元素区 - 数组下标元素标记为 hole(PropMetaEntry.hole),length 不变, 存在性检查(resolve_property/get_own_property_slot/ordinary_get/for-in) 判 hole,重赋值自动清除标记 - 不可配置属性统一返回 false(sloppy 语义,strict 抛错留待 emit 追踪严格模式) - set_or_create_prop_value 数组下标键路由元素区,修复 delete 后重赋值误入 shape 链 test262 Object +212 PASS/-102 FAIL,Array +149 PASS/-60 FAIL,无回归。