SPWeb.Site, should you call Dispose() on it?

Updated 06/08/2009 15:52: Short answer NO. Original question:

I can't find any reference which gives guidance on SPWeb.Site regarding disposing. I've gone through some of the more popular best practises documentation on disposing SharePoint objects:

• http://www.sharepointdevwiki.com/display/public/When+to+Dispose+SharePoint+objects
• http://msdn.microsoft.com/en-us/library/aa973248.aspx
• http://blogs.msdn.com/rogerla/archive/2008/02/12/sharepoint-2007-and-wss-3-0-dispose-patterns-by-example.aspx

Unfortunately none of these guidelines mention SPWeb.Site. To give some context, I'm writing a public extension API which accepts an SPWeb as an argument to a method i.e.:

public static void GetWebPartFromCatalog(this SPWeb web, string webPartName)
{
     ......

     SPSite site = web.Site;
     ......

     **OR** ??

     using (SPSite site = web.Site)
     {
         ....
     }
}

I've looked as the Close() method in refelector for SPWeb, which is called by SPWeb.Dispose() and there is nothing in it to indicate the actual SPSite member field is disposed of.

Update: 06/08/2009 13:47

At Alex's suggestion

"Put it in a loop which runs 100 times and use the SPRequestStackTrace registry key described in Troubleshooting SPSite/SPWeb leaks in WSS v3 and MOSS 2007 to check that your test code is the source of the problem."

I ran the following pi