LOG_BINDINGS for an ember-cli v 1.13.8 app

I am trying to activate the LOG_BINDINGS flag for an ember-cli app (1.13.8) with ember and ember-data version 2.1. I have tried using Ember.LOG_BINDINGS = true in the app/app.js file, and ENV.APP.LOG_BINDINGS = true; in the config/environment.js file. However, both approaches do not produce messages in the chrome console.