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my @a = ('a', 'b', 'c');

my @a = 'a', 'b', 'c';

( my @a = 'a' ), 'b', 'c';

my @a = ( 1..4 );

my @a = 1..4;

use constant {
  zed     => 0,
...
  repos   => (qw(oss non-oss debug)),
  two     => 2,
};

use constant {
  zed       => 0,
...
  'non-oss' => 'debug',
  two       => 2,
};