prefixMap :: String -> RelationalMap a b -> RelationalMap a b
prefixMap prefix (RM_Nest f rm) = RM_Nest f (prefixMap prefix rm)
prefixMap :: String -> RelationalMap a b -> RelationalMap a b
prefixMap prefix (RM_Nest f rm) = RM_Nest f (prefixMap prefix rm)
prefixMap prefix (RM_Nest f rm) = RM_Nest f (prefixMap prefix rm)