Or using MCE::Loop instead. One can have MCE::Loop gather orderly via MCE::relay.

use MCE::Simple (
    include => [qw/ -strict -signatures -mce_loop /],
    max_workers => 4, init_relay => '',
);

MCE::Simple->init(
    on_finish => sub ( $pid, $exit, $ident, $signal, $error, @ret ) {
        say "MCE job ** $ident ** completed; status $exit.";
        print join('', @ret);
    },
);

spawn "foo", sub {
    my @results = mce_loop {
        my $output = "From chunk_id: ".MCE->chunk_id."\n";
        for my $i (@{ $_ }) {
            $output .= "$i\n";
        }
        MCE::relay {
            MCE->gather($output);
        };
    } 91..99;
};

# do something else

sync;
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Thank you, PerlMonks. I was able to think out loud. The demonstrations work flawlessly.