The setter deduplicates by equality: if the new value == the current value, no notification fires. This works well for enums, strings, and ints, but mutating a mutable object in place and reassigning the same reference won't trigger consumers (because obj == obj is trivially True). Stick to immutable values and this isn't a concern.
南方周末：在“权责利”三位一体的制度闭环下，协会的组织架构应如何设计？
。im钱包官方下载对此有专业解读
2017年，当全球新能源产业还在疯狂抢矿时，他在湖北荆门悄悄建成中国第一条废旧动力电池回收线。
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，这一点在clash下载中也有详细论述
FT Videos & Podcasts，这一点在heLLoword翻译官方下载中也有详细论述
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