no-side-effects-in-computed false positives

[andrei-gheorghiu]

What rule do you want to change?
https://github.com/vuejs/eslint-plugin-vue/blob/master/docs/rules/no-side-effects-in-computed-properties.md

Does this change cause the rule to produce more or fewer warnings?
Produces more warnings (false positives).

How will the change be implemented? (New option, new default behavior, etc.)?
It should not consider

 computed: {
    reversed() {
       return [...this.items].reverse()
    }
 }

a side effect, as it's not. It's pretty much the same as this.items.slice(0).reverse().

[ota-meshi]

Thank you for this issue.

However, it seems to be fixed in v7.0.0-beta. Please you use v7.0.0-beta.
Perhaps it was unintentionally fixed by refactoring #1154, that change to uses the same logic as no-mutating-props rule.