Add option to delete temporary files immediately

// Interval values in seconds:
    $intervals = [0, 1, 21600, 43200, 86400, 604800, 2419200, 7776000];
    $period = array_combine($intervals, array_map([$this->dateFormatter, 'formatInterval'], $intervals));
    $period[0] = $this->t('Never');
    $form['temporary_maximum_age'] = [
      '#type' => 'select',
      '#title' => $this->t('Delete temporary files after'),
      '#default_value' => $config->get('temporary_maximum_age'),
      '#options' => $period,
      '#description' => $this->t('Temporary files are not referenced, but are in the file system and therefore may show up in administrative lists. <strong>Warning:</strong> If enabled, temporary files will be permanently deleted and may not be recoverable.'),
    ];

Unsure if it's worth overwriting the options label from date formatter here for this special case instead of displaying "1 Second"?

Thanks for the quick reaction @longwave. Puh, if that's the case, that's a mean trap. Perhaps that information should also be added as comment in the code?

I didn't know about this and indeed that makes it hard to implement, while I described a case where this functionality would be quite useful.

Yes let's close it won't fix. It's just not worth it, while I think the use case is still there, but also edgy enough to close... Any if anyone will need it for good reasons in the future, we can reopen it and find a solution.