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by lazerwalker 4590 days ago
It might not be that helpful, but you can actually download the JavaScriptCore source directly from the WebKit trunk (http://svn.webkit.org/repository/webkit/trunk/Source/JavaScr...).

It's worth noting that there are some discrepancies between that codebase and the actual behavior of the public iOS 7 framework, but if you're not doing anything too crazy it probably won't be an issue.