[perl #74622] GatherIterator.perl flattens output sometimes.

[Matthew Wilson via RT]

different behavior for the first one:

13:34 < diakopter> r: say ((1,2) X <a b>).perl
13:34 <+p6eval> rakudo e2d876: OUTPUT«((ListIter.new(),), 
(ListIter.new(),),
                (ListIter.new(),), (ListIter.new(),)).list␤»