The normal rule in recent decades has been that when a new justice joins the Supreme Court, to the largest extent possible, the court tends to try not to take the more charged cases the first term. It does happen, but in Justice Amy Coney Barrett’s first year, no really explosive decision came out.But last week is a reminder that this court has changed most rules about how it goes about its business, including the purported joking by Justice Samuel Alito.No advisory opinionsIn my book “The Chief Justices,” one of the …