I'm sorry abinder but I think you're not considering a very important point.

It would not be appropriate for SQL to change the data type of the answer unless it was specifically told to do so. If you are just running a query in query analyzer where you just want to see the result then it's no big deal, but what if the results are to be passed to another process, or stored in a table, that cannot handle the "changed" data type?

You need to look at the full picture before saying that SQL Server should .....