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# arg_1 to arg_n specify size in dimension k,
# last arg is a reference to a sub
...
    }
    $na;
}

$ar = narray(3, sub {$_[0]});
# [0, 1, 2]

$mr = narray(3, 3, sub {$_[0] == $_[1] || 0});
# [[1, 0, 0], [0, 1, 0], [0, 0, 1]]

sub narray (&@);

$ar = narray {$_[0]} 3;

sub narray (&@);
sub narray (&@) {
...
my $na = narray {"<@_>"} 3, 2
# [['<0 0>', '<0 1>'], ['<1 0>', '<1 1>'], ['<2 0>', '<2 1>']]