We want to know the volume of data (count, bytes) that are retained by the final stack scan. It should not be hard to get that - the GC already has exact, up-to-the minute data on volumes scanned. The more interesting problem is the test cases we want to use. Presumably 10-20 SWFs with popular AS3-based content would do the trick, and maybe ESC and abcdump just for grins.
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