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.

Retooled the arguments.callee-related changes in 98ce35d5 to avoid re-declarations where possible.

Enforce that hasClass and removeClass work even with tabs and endlines in class attributes. Fixes #5505.

Disable getting values using the .attr() function shortcut until the full implications of which can be explored.