If you don't want to call sort repeatedly, save the result. 

my @sorted_keys = sort { $a <=> $b } keys(%foo);

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Update: Or if you no longer need the keys: 

my @sorted_values = @foo{ sort { $a <=> $b } keys(%foo) };

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In reply to Re: Permanently sort a hash by ikegami
in thread Permanently sort a hash by Anonymous Monk

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