getDefaultProps() for <AngleBracketComponents/>

[ariesshrimp]

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BUG REPORT

// components/my-button/component.js
export default Component.extend({
  tagName: '',
  propTypes: {
    kind: PropTypes.oneOf(['a', 'b', 'c']),
  },
  getDefaultProps() {
    return {
      kind: 'a'
    };
  }
});

<!-- tempates/components/my-button/template.hbs -->
<button class={{kind}}>{{yield}}</button>

<!-- some template -->
<MyButton>a button with default props</MyButton>

Summary

The above code doesn't apply the expect default for <MyButton/>

Expected Behavior

<MyButton/> should have attrs: {kind:"a"}

Actual Behavior

<MyButton/> has attrs: {}

I dunno, but this library might just be incompatible w/ angle bracket syntax: https://discordapp.com/channels/480462759797063690/483601670685720591/572490471230668812

emberjs/rfcs#479

does that seem right?