Github user Harbs commented on the pull request:
https://github.com/apache/flex-sdk/pull/18#issuecomment-157861022
Using Proxy as a base class for ArrayList will likely have a significant
performance hit. It seems questionable as to whether the benefits of using for
each loops outweigh the performance hit.
http://blogs.adobe.com/aharui/2007/10/actionscript_readwrite_perform_1.html
It might be a good idea to get some performance metrics on ArrayList with
and without Proxy.
Another approach might be to instead of modifying ArrayList itself to be a
subclass of Proxy, to create a new IList to complement it with these changes.
That way clients can decide whether they care about performance of for each
loops.
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