iterate over Array vs. Object (forked from: Performance Test Harness)

I was told that Arrays are faster when iterating even when given mixed String/index-values(/properties) and I couldn't believe it ;)

This wouldn't be possible without Grant Skinner's
Performance Test class (defined below).
http://www.gskinner.com/blog/archives/2009/04/as3_performance.html

Thanks, Grant!