To clarify @$c[0] means the same as @{$c}[0] meaning dereference $c, take array slice
So
$ perl -e " use Data::Dump; my $c = [qw/ a b c/]; dd @$c[1,2]; "
("b", "c")
While References quick reference lists this item explicitly (item 2), its somewhat documented in perlreftut/perlref but its not recommended
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