'A dangerous precedent'
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.，详情可参考纸飞机下载
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НАСА откроет стартовое окно Artemis II в апреле14:57
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