All classes that implement StringInterface in Zircon Profile 8.0

class \Drupal\Core\TypedData\Plugin\DataType\DateTimeIso8601 implements DateTimeInterface
class \Drupal\Core\TypedData\Plugin\DataType\DurationIso8601 implements DurationInterface
class \Drupal\Core\TypedData\Plugin\DataType\Email implements StringInterface
class \Drupal\Core\TypedData\Plugin\DataType\StringData implements StringInterface
class \Drupal\Core\TypedData\Plugin\DataType\Uri implements UriInterface
class \Drupal\filter\Plugin\DataType\FilterFormat implements OptionsProviderInterface

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