Undo input with Cmd/Ctrl-Z doesn't undo

[msacket]

When attempting to undo a value input into a currency field. The input doesn't revert to its previous value. You can try it out with the demo here: https://nbfontana.github.io/ngx-currency/

I'm not sure if this is related to how the model is store internally or if it something else. I've not noticed this behavior with other types of plain inputs bound to ngModel.