Pseudo-Hashes

        $array_ref = 
          [ { NAME => 1, TYPE => 2, size => 3, ... },
            "Fenchurch", "Octopus", "Small",
            3, undef, ... ]

• This was formerly a run-time error:

        $array_ref->{$key}          

• Now it is an abbreviation for this:

        $array_ref->[$array_ref->[0]->{$key}]

• Note that this is somewhat slower than $hash_ref->{$key} would have been

• Let's hope it doesn't happen too much

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