Can't listen for alt, meta, or shift

[bennypowers]

Description

I'm apparently unable to bind to the alt, shift, and meta keys with the following keyBindings property

      keyBindings: {
        'alt': '_handleKeydown',
        'Alt': '_handleKeydown',
        'AltGraph': '_handleKeydown',
        'meta': '_handleKeydown',
        'control': '_handleKeydown', // => control
        'shift': '_handleKeydown',
        'Shift': '_handleKeydown',
        'U+0051': '_handleKeydown',
      },

      _handleKeydown: function(event) { console.log(event.detail.key); },

Expected outcome

pressing alt should log alt, pressing shift should log shift, etc.

Actual outcome

Only pressing ctrl logs control

Live Demo

https://jsbin.com/tuwodezoro/edit?html,output

Steps to reproduce

see demo

Browsers Affected

• Chrome 60 mac.