usage of provide: mutates mixins

[xanf]

Version

2.7.13

Reproduction link

stackblitz.com/edit/js-cz6vhx

Steps to reproduce

1. Open stackblitz repo
2. Observe output

What is expected?

"black hair and brown eyes" should be in output

What is actually happening?

"red hair and brown eyes" is in output

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Vue.js mutates mixin itself during rendering

[qibing147147]

I read the source code and found that it directly modifies the reference of provide, and it also does so in the case of Vue 2.6