src/Config/AbstractConfig.php
public function get($key, $defaultValue = null)
    {
        return $this->has($key) ? $this->data[$key] : $defaultValue;
    }
public function get($key, $defaultValue = null)
    {
        return $this->has($key) ? $this->data[$key] : $defaultValue;
    }
@param      $key
@param null $defaultValue

@return mixed|null|callable