Color binding doesn't support alpha for hex strings missing an alpha portion

[rcoopr]

When adding a binding with an initial value of a hex string with 3 or 6 digits (no alpha portion), the controller does not add an alpha slider.

const PARAMS = {
  tint: '#ff0',
};

pane.addBinding(PARAMS, 'tint', {
  view: 'color',
  color: { alpha: true },
});

I would expect declaring { alpha: true } to always add a supporting alpha slider. As a workaround, you can add the alpha portion to the hex string.

input	has alpha slider
'#fff'	❌
'#ffffff'	❌
'#fffc'	✅
'#ffffffcc'	✅
0xfff	✅
0xffffff	✅