removal of _lifecycleHooks from Vue.config is breaking Vuex initilaisation

[lyonlai]

Version

latest of dev branch, since this commit 69e62f0

Reproduction link

https://github.com/vuejs/vue

Steps to reproduce

1. Build the dev build.
2. start a sample project with vue-cli.
3. follow https://vuex.vuejs.org/en/installation.html & https://vuex.vuejs.org/en/getting-started.html to install and get Vuex going for the project.
4. Run the server and open the project in browser.
5. you will get the following error

TypeError: Cannot read property 'indexOf' of undefined. 
at applyMixin (vuex/dist/vuex.js:16:46)
at Object.install (vuex/dist/vuex.js:675:3)
at Function.Vue.use

What is expected?

This exception should not appear

What is actually happening?

The exception is thrown at run time.

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Raising an issue for dev branch might not be that good, but I just see the breaking commit was there a week ago so I'm just wondering.

Ignore me if you've already got plans for it.