my $de = DataExtract::FixedWidth->new({
 heuristic => \@tuples
 , column_names => [qw/foo bar baz/]
});

foreach my $tuple ( @tuples ) {
  state $row;
  my $hash = $de->parse_hash( $tuple );
  given ( ++$row ) {
    when ( 1 ) { say $hash->{foo} }
    when ( 2 ) { say $hash->{baz} }
  }
}