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$ perl -E 'sub a { my ($b, @c) = @_; $c[0]++ } my @d = (42); a(17, @d); say @d'
42
$ perl -E 'sub a { my ($b, $c) = @_; $c->[0]++ } my @d = (42); a(17, \@d); say @d'
43
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