Useragents and search engine spiders?

[I, Brian]

Just a quick question - does SMF have code that disables session IDs for major search engine spiders?

I had presumed this was the case, but I've noticed recently Google is throwing up a number of session strings on indexed SMF boards, which is a no-no.

However, Google does have a screwy index at present, so I thought it would be something better safe to ask about.