A crazy, crazy array ($d)

array(5) {
  ["input"]=>
  string(23) "yes"
  ["lowascii"]=>
  string(14) "    "
  [0]=>
  array(4) {
    [0]=>
    string(3) "foo"
    [1]=>
    string(9) "bar
"
    [2]=>
    string(6) "yes
"
    [3]=>
    int(1776)
  }
  ["x"]=>
  array(1) {
    ["woot"]=>
    array(2) {
      ["booyah"]=>
      string(26) "meet at the bar at 7:30 pm"
      ["ultimate"]=>
      string(26) "hi there!"
    }
  }
  ["lemon"]=>
  array(1) {
    [0]=>
    array(1) {
      [0]=>
      array(1) {
        [0]=>
        array(1) {
          [0]=>
          array(1) {
            [0]=>
            array(1) {
              [0]=>
              array(1) {
                [0]=>
                array(1) {
                  [0]=>
                  array(1) {
                    [0]=>
                    array(1) {
                      [0]=>
                      array(1) {
                        [0]=>
                        array(1) {
                          [0]=>
                          array(1) {
                            [0]=>
                            array(1) {
                              [0]=>
                              string(3) "far"
                            }
                          }
                        }
                      }
                    }
                  }
                }
              }
            }
          }
        }
      }
    }
  }
}

Create a cage for the array

$d_cage->getAlpha('/x/woot/ultimate')

Fatal error:  Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, ArrayObject given in /home/rosengar/Lib/inspekt/src/Inspekt/Cage.php:1013
Stack trace:
#0 /home/rosengar/Lib/inspekt/src/Inspekt/Cage.php(1013): array_key_exists('x', Object(ArrayObject))
#1 /home/rosengar/Lib/inspekt/src/Inspekt/Cage.php(987): Inspekt\Cage->getValueRecursive(Array, Object(ArrayObject))
#2 /home/rosengar/Lib/inspekt/src/Inspekt/Cage.php(342): Inspekt\Cage->getValue('x/woot/ultimate')
#3 /home/rosengar/Lib/inspekt/Examples/filter_array_cage.php(42): Inspekt\Cage->getAlpha('/x/woot/ultimat...')
#4 {main}
  thrown in /home/rosengar/Lib/inspekt/src/Inspekt/Cage.php on line 1013