Try to use the native JSON parser in all cases and fallback to the old technique otherwise. This allows us to also handle cases where the JSON parser is unable to parse JSON-like strings correctly (e.g. {foo:bar}) which is something that worked before but would stop working with the switch to the new parser.

Try to use XMLHttpRequest in more cases in IE 7. Thanks to Matt Kruse and Sam Collett for the suggestions. Fixes #3623, #2849, #5338, and #5529.

Allow the Makefile to be more resiliant to broken builds and handle redirecting the output better in more shells. Thanks to 'candlerb' on jquery-dev for the suggestion.

Rather than declaring empty anonymous functions all around, introduce and use a single empty function. Thanks to Matt Kruse for the suggestion.

When .bind('unload') was called it accidentally went recursive, from 1bac6165. Fixes #5688.

Experiment switching to using onreadystatechange rather than a setInterval for Ajax requests. Fixes #5735.

Moved jQuery.param "traditional" flag into jQuery.ajaxSettings, can now be overridden via 2nd argument to jQuery.param

Make sure that the correct value is retreived for options that have no value specified, in IE 6. Continues to fix #5697.

Updated the README to reference the Closure Compiler instead of YUI Min. Thanks for the heads-up @_carumba.

Made a number of spacing changes to bring the code more-inline with the jQuery Core Style Guideline.

Stop trying to emulate the focus/blur event in IE, doesn't work as one might expect, anyway. Instead, implement the focusin/focusout events in all other browsers - which creates a much better parity across all browsers. Uses event capturing instead of bubbling to make it happen. Thanks to Alexander for the recommendation and to Joern Zaefferer for the original focus/blur delegation code.

Used the patch from Alexander as the basis for a rewrite of the IE change event logic. Now has full parity with the regular change event in other browsers: Works with regular bind, works better with multiple selects, works as a regular change event (note test suite changes), works with readonly/disabled inputs, and much more. The original patch had a number of problems, including firing the change event too many times, not bubblinb properly, and not handling clicks on multi-selects properly - that should all be fixed now. Thanks Alexander for the patch pushing in the right direction.

Switched from using YUI Compressor to Google Compiler. Minified and Gzipped filesize reduced to 22,839 bytes from 26,169 bytes (13% decrease in filesize). Sizzle copyright was merged into the main header (since it's removed automatically). Still passes all unit tests.