jQuery, MIT and GPL

/*
* jQuery 1.2.6 – New Wave Javascript
*
* Copyright (c) 2008 John Resig (jquery.com)
* Dual licensed under the MIT (MIT-LICENSE.txt)
* and GPL (GPL-LICENSE.txt) licenses.
*
* $Date: 2008-05-24 14:22:17 -0400 (Sat, 24 May 2008) $
* $Rev: 5685 $
*/

This text is the header in the jQuery 1.2.6 release. It’s obvious that it is dual licensed under MIT and GPL, but isn’t it still weird that Microsoft will support and will package a library with text that says “GPL”?

Props to the people at Microsoft who took the risk to push for this really good 3rd party JavaScript library.