Unlike a checkbox, a second click on a radio input won't trigger a

'change' event, since you can't uncheck a radio input without clicking

on a different radio input. This made it impossible to respond to click

events (which I have a need for in another change -- a "Custom" radio

input entry that invokes a dialog).
To get notified on a click event, actions can set

dispatchOnClick: true on the action. Clicking the radio or its label

will then result in the action handler being called, even if the radio

is already checked.
Since the browser will fire both a change and a click event, and there's

nothing we can do about that, we need to use debounce() to ensure the

handler is only called once.

In another change, I added an action with dispatchOnClick: true.
The radio button, when already checked, would trigger my action handler

on click, just once.
When not checked, clicking it would also trigger my action handler, just once.

No repeated events.