atk4\data\Field::__construct PHP Method

    public function __construct($defaults = [])
    {
        if (!is_array($defaults)) {
            throw new Exception(['Field requires array for defaults', 'arg' => $defaults]);
        }
        foreach ($defaults as $key => $val) {
            if (is_array($val)) {
                $this->{$key} = array_merge(isset($this->{$key}) && is_array($this->{$key}) ? $this->{$key} : [], $val);
            } else {
                $this->{$key} = $val;
            }
        }
    }