This isn't exactly what you want, but it ( Data::Rmap) is new to my toolbox and quite handy if your structure becomes more mangled:
use strict;
use warnings;
use Data::Rmap qw(:all);
my @AoH = (
{'name' => 'Barney', 'age' => '34'},
{'name' => 'Fred', 'age' => '36'},
{'name' => { first => 'John', last => 'Doe' }, age => '40' }
);
rmap_hash {
print join "\n" => keys %$_;
print "\n";
} @AoH;
name
age
name
age
name
age
first
last
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