Explain reactivity in Vue 3.
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How does Vue's reactivity system work?
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reactivity
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Vue 3 wraps state in a Proxy (reactive/ref) that intercepts reads to track dependencies and writes to trigger updates. When a reactive value used in a component's render changes, Vue re-runs that component's render function and patches the DOM. (Vue 2 used Object.defineProperty, which couldn't detect new prop
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