$ perl -MTest::More -dE 0
[...]
  DB<1> $a = { qw/a 1 b 2/ }

  DB<2> $b = { qw/a 1 b 2/ }

  DB<3> x $a
0  HASH(0x7f9140905ad0)
   'a' => 1
   'b' => 2
  DB<4> x $b
0  HASH(0x7f914090b698)
   'a' => 1
   'b' => 2
  DB<5> x $a == $b
0  ''
  DB<6> x is_deeply( $a, $b )
ok 1
0  1
  DB<7> x is_deeply( $a, {} )
not ok 2
#   Failed test at /Users/nbkawb9/perl5/lib/perl5/Test/Builder.pm line 152.
#     Structures begin differing at:
#          $got->{a} = '1'
#     $expected->{a} = Does not exist
0  0
  DB<8> q