Adds simplifications made possible in #199 for Array.append for Dict.union and Set.union.
Set.union (Set.fromList [ a, b ]) (Set.fromList [ c, d ])
--> Set.fromList [ a, b, c, d ]
-- Note: Order is reversed
Dict.union (Dict.fromList [ a, b ]) (Dict.fromList [ c, d ])
--> Dict.fromList [ a, b, c, d ]
Adds simplifications made possible in #199 for
Array.append
forDict.union
andSet.union
.