RealDictCursor behavior question - Mailing list psycopg

When using the RealDictCursor from psycopg2 extras, is the behavior of RealDictCursor well defined for the case where you have repeated column names (such as in a join)? That is, obviously a dictionary can only have one value for a key, so is it safe to assume that the value for the column name key in the case of repeated column names is always going to be the one that appears LAST in the query?