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        ...
    );
    %target = (
        a => $foo->z,
        b => $foo->y,
        ...
    );

=head2 method each_source, each_target, source_iterator, target_iterator

This methods allows to work with iterations.

    while ( my ($key, $value) = $self->each_source ) {
        ...
    }

    while ( my ($key, $value) = $self->each_target ) {
        ...
    }

    my $iterator_code = $self->source_iterator;