If set to TRUE the form will skip calling form element value callbacks, except for a select list of callbacks provided by Drupal core that are known to be safe.
This property is uncacheable.
Type: bool
self::setInvalidToken()
protected $invalidToken = FALSE;
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Form!FormState.php/property/FormState::invalidToken/8.1.x