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# reduce(into:value:)

Reduces a property value into an accumulating summary.

```
static func reduce(into summary: inout Self.Summary, value: Self.Value)
```

## Parameters

`summary`

The accumulating summary value to modify.

`value`

The individual property value to incorporate into the summary.

## Discussion

This method is called to incorporate individual property values into a summary
that represents the aggregated state across multiple progress managers.

---

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