If it's super broken or critical, maybe a slot to let the user provide their desired header level would be an option? Or maybe even a simple prop would be enou

If it's super broken or critical, maybe a slot to let the user provide their desired header level would be an option? Or maybe even a simple prop would be enough. If your component is itself header-like, perhaps making 6 versions, fun-header-1, fun-header-2, etc. that are explicitly scoped to that level header would make sense too.