Rather than fully removing the key from the map, we set the register value to null. The metadata is kept around so we can disambiguate deletions from states that simply don’t have a key yet. These are called tombstones — the ghosts of CRDTs past.
发布会详尽展示了小米电动滑板车 6 Ultra 全方位的硬件升级，尤其是「Ultra 级」的性能。台上的产品经理强调，超大杯的命名，来源于设计与全地形能力的全面提升。
，更多细节参见同城约会
Two standard models make this concrete:
But a combined Paramount-Warner Bros would also leave it in control of a significant slice of sports and children's entertainment, raising potential concern for advertisers and local television distributors.