Fix(reactive) add 'shallow' propety in proxy

[lijingfaatcumt]

No description provided.

[posva]

What is this fixing? I'm closing #2957 in favor of this but this needs a reproduction or test case

Are you trying to fix the same thing as #3003

[lijingfaatcumt]

What is this fixing? I'm closing #2957 in favor of this but this needs a reproduction or test case

Are you trying to fix the same thing as #3003

@posva i want add property '__v_isShallow' in a proxy object as '__v_isReadonly' because i may want to know a proxy is shallow or not, to
know if we change the deep property whether that will trigger corresponding effects running or not

[posva]

If you don't create a boiled down repro showing the existing problem or provide test cases, this won't be able to go any further...

[lijingfaatcumt]

If you don't create a boiled down repro showing the existing problem or provide test cases, this won't be able to go any further...

@posva isShallow is useful, please see #3052 , i use isShallow to separete reactive and shallowReactive

[posva]

Okay, then I'm closing this in favor of #2851 or #3052. If you think those PR, which have tests, are missing something, please add a review. If this is unrelated, add tests and ping me so I can reopen