Button is not disabled with disabled attribute #2.0-preview

[fairsayan]

Description

Unable to disable paper button with #2.0-preview branch

The Code

<paper-button id="login" on-tap="_onTapLoginButton" autofocus disabled>{{localize('Login')}}</paper-button>

...

_onTapLoginButton () {
  console.info('aa');
}

The 'aa' string is always printed

Browsers Affected

• [X] Chrome
• [ ] Firefox
• [ ] Safari 9
• [ ] Safari 8
• [ ] Safari 7
• [ ] Edge
• [ ] IE 11
• [ ] IE 10

[notwaldorf]

Looks disabled (and adding a listener does not get fired) in the demo so I think this is an old issue