"The MacBook Pro costs $1999 and features M3 chip, 16GB RAM, and 512GB storage.",
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.
，详情可参考搜狗输入法
6. Imagination ·
目前，扬子江正依托稳健的研发体系与规范化的中药材种植基地，积极联合产业链供应链伙伴共同增强抗风险能力，努力将产地和产业、企业和农户、产品和消费者间的距离拉得更近，助力实现上中下游协同联动，全链条闭环发展。