make future proof

[spruce]

https://gist.github.com/samselikoff/1d7300ce59d216fdaf97

See: indexiatech/ember-forms#94

[pedrokiefer]

Could we try to list what we need to change? From the top of my head I only know that we have to cleanup the deprecation messages when running on canary.

[spruce]

That sounds right. Other thing I had in mind was data down, actions up. That we follow that paradigm.

[spruce]

We should use the mut helper to change the values and not binding to them

[spruce]

I think we don't need to do this. Since we would have the same affect and no clear benefit