Notice how we never remove deleted keys from the map. This is one drawback to CRDTs — we can only ever add information, not remove it. Although from the application’s perspective the key has been fully deleted, the underlying state still records that the key was once there. In technical terms, we say that CRDTs are monotonically increasing data structures.9
A NoSQL database.
，这一点在纸飞机下载中也有详细论述
Последние новости
传统内衣是典型的非标品，每个人胸型千差万别，因此传统内衣品牌设置复杂的尺码体系（如70B、75C），以适应消费者的长尾需求。以内衣品牌爱慕为例，其女士内衣最多分出22个尺码，叠加三个不同色号，单个产品可以细分出66个不同选择。
Photograph: Julian Chokkattu