useVModel does not work with classes

[ghost]

Describe the bug

When you pass a class to useVModel it emits a data object rather than an instance of the original class. The original object's prototype data does not match the prototype data on the emitted object. This seems like a bug. If it's not possible to fix, maybe we need another composable, something like useClassVModel.

See the repro.

Reproduction

https://stackblitz.com/edit/vitejs-vite-ah9zrf?file=src/Child.vue

System Info

System:                                               
    OS: Windows 10 10.0.19043                           
    CPU: (8) x64 Intel(R) Core(TM) i7-9700 CPU @ 3.00GHz
    Memory: 12.39 GB / 31.79 GB                         
  Binaries:                                             
    Node: 14.17.5 - C:\Program Files\nodejs\node.EXE    
    Yarn: 1.22.18 - ~\AppData\Roaming\npm\yarn.CMD
    npm: 6.14.8 - C:\Program Files\nodejs\npm.CMD
  Browsers:
    Chrome: 100.0.4896.127
    Edge: Spartan (44.19041.1266.0), Chromium (100.0.1185.50)
    Internet Explorer: 11.0.19041.1566
  npmPackages:
    @vueuse/core: 8.2.5 => 8.2.5
    vue: ^3.2.33 => 3.2.33

Used Package Manager

yarn

Validations

• Follow our Code of Conduct
• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Make sure this is a VueUse issue and not a framework-specific issue. For example, if it's a Vue SFC related bug, it should likely be reported to https://github.com/vuejs/core instead.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion.
• The provided reproduction is a minimal reproducible example of the bug.