All classes that implement FormCacheInterface in Drupal 8

class \Drupal\Core\Form\FormBuilder implements FormBuilderInterface, FormCacheInterface, FormSubmitterInterface, FormValidatorInterface, TrustedCallbackInterface
class \Drupal\Core\Form\FormCache implements FormCacheInterface
class \Drupal\autosave_form\Form\AutosaveFormBuilder uses AutosaveButtonClickedTrait
class \Drupal\bibcite_entity\ReferenceFormBuilder
class \Drupal\securepages\FormBuilder
class \Drupal\webprofiler\Form\FormBuilderWrapper
class \Drupal\webprofiler\Form\FormBuilderWrapper
class \Drupal\webprofiler\Form\FormBuilderWrapper

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