Deprecations for Enumerable#contains usage.

[rwjblue]

In Ember 2.8.0-beta.1+ the ember-runtime-enumerable-includes feature is enabled (read more about it in the RFC). Many deprecations are triggered by Ember Data.

It would be great to get this fixed before ember-data@2.8.0 stable is released, though I haven't dug into how much work it would be to fix.

[rwjblue]

I created https://github.com/rwjblue/ember-runtime-enumerable-includes-polyfill to make this a bit easier for Ember Data (and other addons) to avoid deprecations, use the newer syntax, and not trigger deprecations.

[pangratz]

I guess this is fixed by #4519 and can be closed, right?

[bmac]

Yes.