[perl #77160] Match.list flattens quantified sub-captures

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# New Ticket Created by  Moritz Lenz 
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16:34 < moritz_> rakudo: 'abc' ~~ /(.)+/; .say for $/.list
16:35 <+p6eval> rakudo fcf4f3: OUTPUT«a␤b␤c␤»

$0 should really be an array (but in item context), and only $0.flat 
should flatten it out.