Vue version

3.3.4

Link to minimal reproduction

https://play.vuejs.org/#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

Steps to reproduce

Use v-for on an object with value and key as iterators, like in https://vuejs.org/guide/essentials/list.html#v-for-with-an-object
Then check the type of the key variable (number)

What is expected?

The key type should be string

What is actually happening?

The key type is number

System Info

No response

Any additional comments?

My guess is that it is typed as a number because v-for is usually used on an array, and in that case the second argument is the index. But v-for also supports iterating on an object and in that case it will be a string.