Your message was ambiguous to me. But I will admit that I was also quite hungover so it’s possible that the error was mine.

In answer to your question: I’ve only really used keyup for either one time events (like keyboard shortcuts for UI elements) and for ending the status of repeated events (eg movement in games, dragging UI elements, etc).

I think if you were to search for key up events in GitHub, most of references might likely be games and other visual interactions rather than text entry.