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docs: explain reactive state cloning caveats - #3490
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Description of Problem
The
toRaw()reference does not explain its limits when cloning reactive state. Unwrapping the outer proxy can still leave nested reactive objects or refs in the raw data.Addresses the cloning guidance requested in #3223.
Proposed Solution
Explain that
toRaw()returns the original object, show whenstructuredClone(toRaw(state))can be used, and state that nested reactive values must also be converted to supported plain data. This adds the caveat without prescribing a general cloning utility or library.Additional Information
Validation: the full site build passed with pnpm 10.33.0. Ten Node assertions with Vue 3.5.42 checked direct proxy rejection, raw-object identity, an independent deep clone of plain data, nested proxy rejection, and preservation of nested refs in raw data. The paragraph was inspected in Chrome at 1440px and 390px, with no horizontal overflow or page errors.