docs: 文字错误
春变更 -> 纯变更
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@ -408,7 +408,7 @@ So Angular uses a faster change-detection algorithm for executing a pipe, as des
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### Detecting pure changes to primitives and object references
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### 检测原始类型和对象引用的春变更
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### 检测原始类型和对象引用的纯变更
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By default, pipes are defined as *pure* so that Angular executes the pipe only when it detects a *pure change* to the input value.
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A pure change is either a change to a primitive input value (such as `String`, `Number`, `Boolean`, or `Symbol`), or a changed object reference (such as `Date`, `Array`, `Function`, or `Object`).
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