For my own edificiation, would we expect B::Deparse to have broken this down further? This was my first attempt to decompose it.

perl -MO=Deparse -e '(my ($x, $y, $z) = qw( 1 2 3 )) = qw( a b c )'
(my($x, $y, $z) = ('1', '2', '3')) = ('a', 'b', 'c');
-e syntax OK