This will pass a reference to a new copy of the original reference's data ("sub" is a really bad name for a sub, so I'll call it "stub"):

stub([@{$arrayRef}]);
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That only copies down one level, so if $arrayRef is an AoA or something you'll need to adapt a deeper copy for true isolation;

stub([map {[@$_]} @$arrayRef]);
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for an AoA, or

stub([map {{%$_}} @$arrayRef]);
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for an AoH, for instance.