# Functions
NewDeduplicate 保留不重复的.
NewDeduplicateWithKeys 保留不重复的，并传入已有的元素列表.
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NewFilterAllRemain 保留所有.
NewFilterFirstN 保留前 n 个.
NewOperatorChain 处理链，将多个 Operator 串联起来，任一 Operator 失败直接中断.
NewOperatorSink 将 Operator 包装成 go-streams 支持的 Sink.
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# Variables
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# Structs
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# Interfaces
Archiver 归档器，能够提供原有的数据的Keys，并且能够操作数据.
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KeysInitiator 能够获取已有的数据的Keys.
Operator 能对 Cubox Item 进行处理.
Source 能够提供 Cubox Item 的数据源.
# Type aliases
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