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docs: Reference svelte/reactivity from $state. (#13571)

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documentation/docs/02-runes/02-$state.md
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@ -20,6 +20,8 @@ Unlike other frameworks you may have encountered, there is no API for interactin
If `$state` is used with an array or a simple object, the result is a deeply reactive _state proxy_. [Proxies](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy) allow Svelte to run code when you read or write properties, including via methods like `array.push(...)`, triggering granular updates.
> [!NOTE] Classes like `Set` and `Map` will not be proxied, but Svelte provides reactive implementations for various built-ins like these that can be imported from [`svelte/reactivity`](./svelte-reactivity).
State is proxified recursively until Svelte finds something other than an array or simple object. In a case like this...
```js