There was widespread expectation that the latest round of seller-friendly changes to the government-sponsored enterprises’ representation-and-warranty framework would encourage lenders to liberalize their credit overlays. So far in 2015, the data aren’t showing it. In fact, the case could be made that credit trends are going the other way. The average credit score for purchase mortgages securitized by Fannie Mae and Freddie Mac was...[Includes one data table]