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If a site routinely uses the www - so does google (you are right in thinking it didn't use to be this way).
It has no problems finding major sites either way:
[google.com...]
[google.com...]
and so on, but some sites that apparently only have www links need to have that for the site info to come up.
I think they should do it the way you have suggested, but I don't see this as a real problem for any site that has at least one link from a non www source (at least that is the way it appears to me - can't say for sure that is the rule).
Sites do exist without being in google and people should be typing addresses in the address bar.
I can't imagine they would want it this way - I think it used to even change it to the correct type. It seems to in some cases.
Google is usually known as www.google.com - the way people link to it. And it will change google.com to www.google.com in the mouseover.
The opposite is true with dmoz. Most people link to it with dmoz.org and if you type in www.dmoz.org - it changes it in the mouseover to dmoz.org.