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In celebration of jQuery’s 4th birthday, the jQuery team is pleased to release the latest major release of the jQuery JavaScript library! (...) With jQuery 1.4 we attempted to minimize any large upgrade hassles – maintaining the signatures of all public functions. That being said, please read through the list of potentially-breaking changes to be aware of what might cause problems in your applications. (...) Many of the most popular and commonly used jQuery methods have seen a significant rewrite in jQuery 1.4. When analyzing the code base we found that we were able to make some significant performance gains by comparing jQuery against itself

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