that new features are introduced in a backwards compatible way.</p>
<p>To give the project a path forward when a breaking change is mandatory, we've released the <a href="https://github.com/emberjs/ember-optional-features"><code>@ember/optional-features</code></a> addon.</p>
<p>This addon does nothing by default, but provides a command-line interface to enable and disable breaking changes in Ember.</p>
<h2 id="toc_installation">Installation <a href="#toc_installation"><svg xmlns="http://www.w3.org/2000/svg"