The array of values as they were submitted by the user.
These are raw and unvalidated, so should not be used without a thorough understanding of security implications. In almost all cases, code should use the data in the 'values' array exclusively. The most common use of this key is for multi-step forms that need to clear some of the user input when setting 'rebuild'. The values correspond to \Drupal::request()->request or \Drupal::request()->query, depending on the 'method' chosen.
This property is uncacheable.
Type: array
protected $input;
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Form!FormState.php/property/FormState::input/8.1.x