array(1) {
  ["foo"]=>
  array(1) {
    ["bar"]=>
    array(2) {
      [0]=>
      string(3) "BAR"
      [1]=>
      array(2) {
        ["@mocha"]=>
        string(3) "ABC"
        ["$"]=>
        string(3) "BAR"
      }
    }
  }
}