That was an easy example a gave of one of the minor hiccups, and it wasn't Arrays, but Sparse Arrays, which we were abusing. It's a case where using standard APIs, not proprietary APIs, leads to gotchas because of implementation differences between VMs, which normally don't manifest themselves in smaller apps, but do in large sophisticated apps.

The real blocking issue is very bad rendering performance, but that has been worked on for months now and you should see the results soonish. That's harder to illustrate in an HN thread. I've still got scars from the last discussion on this, so I'd advise people go read those old HN threads for insight. :)