I apologise for being off-topic right in the first reply, but:

my $vars = {
  
     cases          =>  @cases
};
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This poked me in the eye, and I don’t think you can do that — well, you can, but you probably shouldn’t. This will create $vars with { cases => $cases[0], "$cases[1]" => $cases[2], … } and that’s more than likely not what you want.