fix: ssrRef crashes with nested frozen object

[pleinon]

🐛 The bug
I am using Apollo Client which returns response data as frozen (Object.freeze()) on development mode. Looks like this causes ssrRef.value mutation to crash when frozen data has nested objects:

'get' on proxy: property 'nested' is a read-only and non-configurable data property on the proxy target but the proxy did not return its actual value (expected '#<Object>' but got '[object Object]')

🛠️ To reproduce
Steps to reproduce the behavior:

const crashTest = ssrRef<any | null>(null)
crashTest.value = Object.freeze({
  test: 'works',
  nested: {}, // crash
})

🌈 Expected behaviour
ssrRef should be able to handle frozen complex objects.

ℹ️ Additional context
Sample is greatly simplified from my Pinia-state. Crashing code is executed in store during server side useFetch.

[pmrotule]

We're experiencing the same issue and the only workaround we found was to deep-clone all results coming from ApolloClient which is pretty bad for performance. Would be great to have a proper fix 🙏