YAML.pm - Add $YAML::Preserve

Setting $YAML::Preserve will keep the order of hash keys

use YAML; $YAML::Preserve = 1; my $yaml = <<'EOM'; z: 1 a: 2 y: 3 EOM my $data = Load $yaml; print Dump $data; __END__ z: 1 a: 2 y: 3

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