Using "override" or just plain redefine the subroutine in perl

Question

Have this example code - 2 packages which extends the Some package and redefines the func method.

use 5.014;
use warnings;

package Some {
    use Moose;
    use warnings;
    sub func { say 'func from Some'; }
}

package Over {
    use Moose;
    use warnings;
    extends 'Some';
    override 'func' => sub { say 'func from Over'; };
}

package Plain {
    use Moose;
    use warnings;
    extends 'Some';
    sub func { say 'func from Plain'; };
}

#main
for my $package ( qw(Some Over Plain) ) {
    my $instance = $package->new();
    $instance->func;
}

runnig the code gives:

func from Some
func from Over
func from Plain

e.g. the func method is redefined in both cases, without any warning or such.

The questions:

• are here some meaningful differences between the two ways?
• when I should use the override and when the plain redefine?
• is this discussed in some doc?

Answer 1

The documentation answers this perfectly.

override ($name, &sub)

An override method is a way of explicitly saying "I am overriding this method from my superclass". You can call super within this method, and it will work as expected. The same thing can be accomplished with a normal method call and the SUPER:: pseudo-package; it is really your choice.