database/sql: Export TracedConn, as we need it when using the db.Conn Raw() API call. #1779
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We would prefer to be able to type assert to this interface type, but we cannot type assert without the type being exported. The alternative would be to use reflection here.
In addition, we want to be able to, on occasion, access the underlying connection object, hence the addition of the WrappedConn() function.
This is an up-to-date-version of #1566 , you can read this change there.