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my $TEST_REC_FORMAT = get_msg_format [
   status => 'n  ',   #   0
...
];

my %test_vals = parse_msg($TEST_REC_FORMAT, $rec);

my $TEST_REC_FORMAT = MessageFormat->new([
   status => 'n  ',   #   0
...
]);

my %test_vals = $TEST_REC_FORMAT->parse($rec);