ember inputs always render as disabled

When rendering inputs using the input helper, the disabled attribute in the input tag comes in stringified. This results in inputs always being rendered as disabled

Markup

<p>
  <div>A W3C input (disabled is not present in attrs)</div>
  <input type="text" value='Hello Input!'>
</p>

<p>
  <div>A W3C input (disabled is present in attrs)</div>
  <input type="text" disabled value='Hello Input!'>
</p>

<p>
  <div>An Ember input (disabled is not specified)</div>
  {{input type="text" value='Hello Input!'}}
</p>

<p>
  <div>An Ember input (disabled=true)</div>
  {{input type="text" disabled=true value='Hello Input!'}}
</p>

<p>
  <div>An Ember input (disabled=false)</div>
  {{input type="text" disabled=false value='Hello Input!'}}
</p>

Rendered HTML

<p>
  </p><div>A W3C input (disabled is not present in attrs)</div>
  <input type="text" value="Hello Input!">
<p></p>

<p>
  </p><div>A W3C input (disabled is present in attrs)</div>
  <input type="text" disabled="" value="Hello Input!">
<p></p>

<p>
  </p><div>An Ember input (disabled is not specified)</div>
  <input id="ember367" disabled="false" type="text" value="Hello Input!" class="ember-view ember-text-field">
<p></p>

<p>
  </p><div>An Ember input (disabled=true)</div>
  <input id="ember368" disabled="true" type="text" value="Hello Input!" class="ember-view ember-text-field">
<p></p>

<p>
  </p><div>An Ember input (disabled=false)</div>
  <input id="ember369" disabled="false" type="text" value="Hello Input!" class="ember-view ember-text-field">

Simple project for reproducing: https://github.com/mike-north/bug-fastboot-inputs

• Clone it
• npm i; bower i
• ember fastboot --serve-assets

[rwjblue]

The fix would have landed with Ember 2.7.0-beta.1. I submitted https://github.com/mike-north/fastboot-disabled-inputs/pull/1 to show that it works properly.

[mike-north]

TL;DR - not sure, because I’m not sure what the expected behavior is for 1.0.0-beta.4

Source of example is here https://github.com/mike-north/fastboot-disabled-inputs

And if you run ember build && ember fastboot you’ll see the same inputs disabled as reported in the original issue. I added some CSS to make it easier to see

Of course, if you add the --serve-assets flag, ember will render the inputs correctly on the client side. When I originally reported the bug, I think client-side assets were not being served (resulting in the reported behavior, even with --serve-assets), however the original problem still exists as reported for the server-side-rendered html. Boolean attribute values are still serialized as strings.