Most of your problems would go away if you replace the unfriendly data structure inside the places slots by a simple hash: 
for my $entry (values %$list) {
    $entry->{places} = { map %$_, @{$entry->{places}} };
}

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In reply to Re: Getting unexpected errors when trying to sort hash of hashes by salva
in thread Getting unexpected errors when trying to sort hash of hashes by nysus

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