Yup, you got it. I had been unable to create a matching data structure prior to your hint. This works:

   print "Print city: $result->[0]{'city'}\n";
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But I decided the following looked "cleaner". It makes me cringe, but here it is:

     my %hash = %{$result->[0]};  # copy result to new hash
     ...
     print "Print city: $hash{'city'}\n";
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I still can't quite figure out why Frontier::Client put this result in such a pointlessly nested data structure...