What would be a more robust way of solving this?

I think natural sort - as Corion suggested - would fit the bill quite well: 

use Data::Dumper;
use Sort::Naturally;

$Data::Dumper::Sortkeys = sub {
  my ($hash) = @_;
  return [ nsort( keys %$hash ) ];
};

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In reply to Re^2: Using Data::Dumpers Sortkeys subroutine by almut
in thread Using Data::Dumpers Sortkeys subroutine by nysus

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