Does iBA use the new/latest JS engine?

I have an HTML5 Canvas / Javascript animation running in an HTML container and I cant tell if (performance wise) if its running the newer JS engine. I know that uiwebview/iOS apps do not use the hew engine so Canvas is kind of limited to what you can pull off. I dont have two iPad 1's to test a side by side iOS 4 & iOS 5.
http://youtu.be/jdcSTK09dcI

iOS 5 uses a newer WebKit over previous versions...

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    Revision: 4634
    Author:   [email protected]
    Date:     2009-01-22 17:38:56 -0800 (Thu, 22 Jan 2009)
    Log Message:
    First part of glue code for allowing Halo components to use the new Text Layout Framework, in order to get functionality such as bidirectional text.
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