How to use this.$patch in Setup Stores

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Reproduction

---

Steps to reproduce the bug

In vuex i do years ago

    data[key] = {
      count: 0,
      items: [],
    }
    data = Object.assign({}, data) // or vue set, may be now is not required that

Expected behavior

mutate state

Actual behavior

all uses options api in examples

Additional information

No response

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var.value

[serialine]

#1012 (comment)

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It work without it. At that moment i not usevar.value