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.

Added additional checks for DOM nodes and window to isPlainObject, IE 8 was still letting those pass through. Fixes #5669.

Disabled the passthrough .attr(method_name) functionality. You can now use it if you do: .attr({method_name: value}, true) OR as an easy initialization method: jQuery('<div/>', {html: '...', id: 'test'}).

Made isPlainObject() supporting null, undefined, and window values on IE too. Also added some related tests. Fixes #5669.

Backing out the change from 841f9ff7, it was ineffectual in Internet Explorer. Keeping the broken test case, for now, so that we can check into the issue some more.

Removed jQuery.fn.contains - didn't match the :contains() selector and confused things. Thanks ajpiano for the tip.

Ignore case of script tags to make sure they're removed. Fixes #5668. Thanks to Motty/Fudgey for the report and Jitter for the patch!

Add new html5 input types to list of serializable types. Older browers handle these as type="text" so they should be consistently serialized on both old and new browsers. Fixes #5667.

Reorganized param code slightly to once again define buildParams as a named function expression, as moving it outside the param closure would necessitate moving and rewriting the add function as well.

Further modified jQuery 1.4 .param() method to serialize arrays containing non-scalar values. PHP and jQuery BBQ can both deserialize these structures, while rack (as of 1.0.0) cannot.

Revert the changes from 65ebf57c, they were ineffectual against IE's insanity: http://ejohn.org/files/bugs/fragment/ Used a different tactic instead (just don't return a fragment from .parent()). Fixes #5638.