列表加了wx:key后，导致列表每一项一直在内存中
加了wx:key就是为了优化列表，但是现在微信小程序的测试效果，加了wx:key反而会导致程序越来越卡，所有列表的数据得不到释放
场景：一个商品列表500条数据，点击按钮刷新商品列表数据，结果内存一直增加
复现代码片段：https://developers.weixin.qq.com/s/VU4zdem376Rv
真机联调效果：
加了wx:key，真机调试效果，内存一直增加
不加wx:key效果，内存不变
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不是预期表现，我们排查一下