Reactivity: Support for shallow collections

[doman412]

Version

3.0.0-beta.13

Reproduction link

https://jsfiddle.net/exp6b1Lj/2/

Steps to reproduce

• create a shallow Set shallowReactive(new Set())
• add an object to the set
• iterate over the set or convert to an array
• objects in the loop or new array will be reactive

What is expected?

Collections should respect the shallow-ness and not covert objects added to the collection to reactive objects.

What is actually happening?

Objects added to collections are being converted to reactive objects despite the collection being created with shallowReactive

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I am using the @vue/reactivity package in another project and came across this issue. Looking through the source it seems like this is not even a feature of collections at the moment as the object is always wrapped by either toReadonly or toReactive. My use case is I want to mainly track the changes to the collection itself, adding, setting, deleting without converting the objects within.