Make editing/extending jQuery.data objects slightly less verbose

jquery.dataExtend.js

/*
$(el).data() is fine if you're using it for simple key/value pairs, but if there's any depth (objects), adding to or modifying said objects becomes a verbose pain in the ass.
This extension method uses $.extend() to add or modify any object with the given key:

$(el).data('plugin',$.extend($(el).data('plugin'),{state:1}))

...becomes:

$(el).dataExtend('plugin',{state:1}) 

...and you can use the same $.extend syntax to do deep copies, overload several objects, etc.
*/

$.fn.dataExtend = function(){
	// Are we in a deep copy situation?
	// If so the data object label will be the second argument.
	var i = typeof arguments[0] === "boolean" ? 1 : 0;
	
	// Grab the label before replacing it in the arguments.
	var key = arguments[i];
	
	// Replace the label with the actual object.
	arguments[i] = this.data(arguments[i]);
	
	// Replace data with itself extended by whatever was passed.
	this.data(key,$.extend.apply(this,arguments));
	
	return this;
}