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void Aggregation::produce() {
，详情可参考搜狗输入法
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.
After the release of the Headphone 1 last year - Nothing's first over-ear headphones - the company is back with the Headphone A. They're a slimmed-down over-ear option that keep the Nothing design aesthetic and excellent controls while decreasing the weight and bumping battery life up to a maximum of 135 hours. There are some concessions - middling call quality and a carrying bag instead of a case - but they're also cheaper at $199. The Headphone A makes more sense to me than the Headphone 1 ever did, and are a great second offering from Nothing.