Error in VuexLogger on splice array

[FreakyHead]

Version

4.0.0-beta.4

Reproduction link

none

Steps to reproduce

Enable Logger for Vuex (createLogger)

1. Add to store param with an array value (list)
2. Create a mutation to change param above (list.splice(0,1))
3. Call mutation
4. Got error

What is expected?

No errors

What is actually happening?

 TypeError: Cannot convert a Symbol value to a number
    at vue.js:431
    at Map.forEach (<anonymous>)
    at trigger (vue.js:430)
    at Object.set (vue.js:592)
    at Proxy.splice (<anonymous>)
    at Proxy.arrayInstrumentations.<computed> (vue.js:522)
    at Store.REMOVE_CALCULATION (C:\Users\denva\WebstormProjects\agenta.web\src\store\modules\Claculator\Calculator.ts:54)
    at wrappedMutationHandler (vuex.esm-bundler.js:802)
    at commitIterator (vuex.esm-bundler.js:434)
    at Array.forEach (<anonymous>)

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If I disable Logger no errors will

[posva]

https://new-issue.vuejs.org/?repo=vuejs/vue#why-repro