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Session variables can be set with an array and then retrieved using dot syntax...

\Session::set('one', array('two' => array('three' =>'value123')));
$one   = \Session::get('one', 'not one');
$two   = \Session::get('one.two', 'not two');
$three = \Session::get('one.two.three', 'not three');
Debug::dump($one, $two, $three);

Variable #1:
array(1) {
  ["two"]=>
  array(1) {
    ["three"]=>
    string(8) "value123"
  }
}

Variable #2:
array(1) {
  ["three"]=>
  string(8) "value123"
}

Variable #3:
string(8) "value123"

Apparently, an individual element in an array cannot be set using dot syntax.
This code will set a single element with the key 'four.five.six'...

\Session::set('four.five.six', 'value456');
$four = \Session::get('four', 'not four');
$five = \Session::get('four.five', 'not five');
$six = \Session::get('four.five.six', 'not six');
Debug::dump($four, $five, $six);

Variable #1:
string(8) "not four"

Variable #2:
string(8) "not five"

Variable #3:
string(8) "value456"

Is this the desired behaviour?