Function _fnExtend

blockstrap/js/dependencies/tables.js:4891–4915

* Extend objects - very similar to jQuery.extend, but deep copy objects, and * shallow copy arrays. The reason we need to do this, is that we don't want to * deep copy array init values (such as aaSorting) since the dev wouldn't be * able to override them, but we do want to deep copy arrays.

( out, extender, breakRefs )

	 *  @todo This doesn't take account of arrays inside the deep copied objects.
	 */
	function _fnExtend( out, extender, breakRefs )
	{
		var val;
	
		for ( var prop in extender ) {
			if ( extender.hasOwnProperty(prop) ) {
				val = extender[prop];
	
				if ( $.isPlainObject( val ) ) {
					if ( ! $.isPlainObject( out[prop] ) ) {
						out[prop] = {};
					}
					$.extend( true, out[prop], val );
				}
				else if ( breakRefs && prop !== 'data' && prop !== 'aaData' && $.isArray(val) ) {
					out[prop] = val.slice();
				}
				else {
					out[prop] = val;
				}
			}
		}
	
		return out;
	}
	
	
	/**