`clearOnUnmount` not working?

Hey there, thanks so much for your work on this!

I see in your documentation that `clearOnUnmount` should allow identical messages to be repeated. This is something we'd like to accomplish in a feature where a small toast element should be repeatedly visible if another element is focused. I see that there is handling for re-calculating the ids, but it doesn't appear as though those ids make their way into the messages that get rendered here: https://github.com/AlmeroSteyn/react-aria-live/blob/0e399857b7e3d0da6d8e5b678814433c3d825237/src/modules/Announcer.js#L76

I'm setting `clearOnUnmount` but the messages do not appear to rebroadcast using VoiceOver in Chrome. Could you help get me moving in the right direction?