Issue #3135305 by longwave: Remove Symfony 4.1 compatibility layer from EmailConstraint

   * {@inheritdoc}

   */

  public function __construct($options = []) {

    // Since Symfony 4.1, the 'mode' property is used, for previous versions the

    // 'strict' property. If the 'strict' property is set,

    // \Symfony\Component\Validator\Constraints\EmailValidator will trigger

    // a deprecation error, so only assign a value for versions of Symfony

    // < 4.2. This compatibility layer can be removed once Drupal requires

    // Symfony 4.2 or higher in https://www.drupal.org/node/3009219.

    if (property_exists($this, 'mode')) {

      $default_options = ['mode' => 'strict'];

    }

    else {

      $default_options = ['strict' => TRUE];

    }

    $options += $default_options;

    $options += ['mode' => 'strict'];

    parent::__construct($options);

  }