Defines the stream wrapper bit flag for a hidden file.
This is not visible in the UI or accessible via web, but readable and writable; for instance, the temporary directory for file uploads.
const HIDDEN = 0x000C;
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!StreamWrapper!StreamWrapperInterface.php/constant/StreamWrapperInterface::HIDDEN/8.1.x