Oh thanks that's indeed interesting, Perl core finally allowing aliasing of lexicals! :)

... not sure if it solves the all issues yet...

But you know these new possibilities deserve a proper thread ...

update

hmm ... coupling is broken after assigning a new ref

use 5.22.0;
use feature qw/say refaliasing/;
no warnings "experimental::refaliasing";

\my @a = my $a = [666];
say "noref: $a[0], ref: $a->[0], list: @a";    
$a = [42];
say "noref: $a[0], ref: $a->[0], list: @a";
[download]

-->

noref: 666, ref: 666, list: 666
noref: 666, ref: 42, list: 666
[download]

update

at least passing arrays to arrays is possible now

use 5.22.0;
use feature qw/say refaliasing/;
no warnings "experimental::refaliasing";

my @a = (666,42);

test (\@a,\@a);

sub test {
    (\my @sub, my $ref) = @_;
    say "noref: $sub[0], ref: $ref->[0], list: @sub";
}
[download]

-->

noref: 666, ref: 666, list: 666 42
[download]

well the syntax when passing more than one argument is not very elegant, see duplicated my ... but at least it's consistent.