#3412894 Classes inheriting from SessionHandler must add return types

to:
  fqn: 'impl:\Drupal\Core\Session\SessionHandler::open'
  params:
    -
      type: string
    -
      type: string
  return_type: bool
to:
  fqn: 'impl:\Drupal\Core\Session\SessionHandler::close'
  return_type: bool
to:
  fqn: 'impl:\Drupal\Core\Session\SessionHandler::read'
  params:
    -
      type: string
  return_type: string|false
to:
  fqn: 'impl:\Drupal\Core\Session\SessionHandler::write'
  params:
    -
      type: string
    -
      type: string
  return_type: bool
to:
  fqn: 'impl:\Drupal\Core\Session\SessionHandler::destroy'
  params:
    -
      type: string
  return_type: bool
to:
  fqn: 'impl:\Drupal\Core\Session\SessionHandler::gc'
  params:
    -
      type: int
  return_type: int|false