DB<14> x \@a
0  ARRAY(0x6005d1060)
   0  0
   1  1
   2  undef
   3  3
   4  4

##</code><code>##

  DB<4> x \@array;
0  ARRAY(0x600500b60)
   0  'O'
   1  1
   2  empty slot
   3  3
   4  4