Mounted hook isn't triggered when instantiated with a parent

[Julien-R44]

Vue.js version

2.0.1

Reproduction Link

https://jsfiddle.net/d8ybasvs/

Steps to reproduce

Instantiate a Vue with a parent, and mounted will not be triggered.

Don't know if this is a normal behavior, but i think not. Tell me if i missed something
I noticed the mounted hook should be called from create-component.js/insert but nothing is going through while executing this code.
Thanks for Vue btw, awesome lib :)