Array keys from computed() fail to update data refs due to reference comparison in mutate() #390

commit: 790a22c

When using a computed() that returns an array as the key, the data ref is never updated even though the fetcher successfully resolves and the cache is correctly populated.

const id = ref('user-1')
const { data } = useSWRV(
  computed(() => ['/api/user', id.value]),  // Returns NEW array each time
  (_endpoint, userId) => fetchUser(userId)
)

In src/use-swrv.ts:128, the mutate() function uses direct reference comparison (===) to filter refs:

let refs = stateRef.data.filter(r => r.key === key)

However, when using a computed() key that returns an array, each evaluation creates a new array instance. While SWRVCache.serializeKey() correctly hashes the array (so cache lookup works), the === comparison fails because:

suggest fix:

-    let refs = stateRef.data.filter(r => r.key === key)
+    const _key = cache.serializeKey(key);
+    let refs = stateRef.data.filter(r => cache.serializeKey(r.key) === _key)