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my @values = @hash{ sort { $a <=> $b } keys %hash };

%hash = ();
@hash{ 0..@values-1 } = @values;

@hash{ keys(%hash), 0..keys(%hash)-1 } = ((undef) x keys(%hash), @hash
+{ sort { $a <=> $b } keys %hash });
delete @hash{ grep !defined $hash{$_}, keys %hash };

@hash{ 0..keys(%hash)-1 } = delete @hash{ sort { $a <=> $b } keys %has
+h };