When filtering by tags it doesn't appear that the order of the tags makes a difference. Eg C#, .NET returns exactly the same page as .NET, C#. While I agree with this, it means that both pages end up being indexed and coming up in search results. Would it be possible to add a canonical tag for these which orders the tags (eg alphabetically) so that search engines only index them once?
I'm not sure whether this counts as a bug or a feature request so I've tagged it as both.