no idea what you are talking about, I'm getting exactly the same results in list context like with an implicit assignment of undefs.
Using deref-operator \ is another case .
DB<7> sub tst2 {print scalar @_ }
DB<8> tst2( my ($a,$b,$c,$d))
4
DB<10> tst2( my ($a,$b,$c))
3
DB<11> tst2( my ($a,$b))
2
DB<12> tst2( my ($a))
1
DB<13> tst2( my ($a,$b,$c,$d)=(undef,undef,undef,undef))
4
UPDATE: ah sorry never mind!
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